"Moderate" suggests a middle level of intensity or volume, in contrast to the loud and harsh nature of something strident.

The given sentence is in Simple Past tense.
The structure of active and passive forms in Simple Past tense is as follows:
Active: Subject + V2 + Object
Passive: Object + was/were + V3 + by + Subject
Example:
Active: Our teacher taught this chapter in the last class.
Passive: This chapter was taught by our teacher in the last class.
Hence, the option that expresses the given sentence in active voice is The airport security refused him admittance.

The given sentence is in Active Voice. As per the given question, we have to change it to Passive Voice.
The structure of the given sentence is as follows:
Subject + V2 + Object. (Active Voice)
Subject (objective case) + was/were + V3 + Object (subjective case). (Passive Voice)
Example: Their cousin showed them some rare photographs.
(Active Voice) They were shown some rare photographs by their cousin.
(Passive Voice) The subject of the given sentence is 'The manager'.
The object of the given sentence is 'the latest assignment.
The subject will be put in place of the object and the object will be put in place of the subject.
And 'explained' will be changed into 'was explained'. Lastly, the preposition 'by' will be added.

The given sentence is in Active Voice. As per the given question, we have to change it to Passive Voice.
The structure of the given sentence is as follows: Subject + V2 + Object.
(Active Voice) Subject (objective case) + was/were + V3 + Object (subjective case).
(Passive Voice) Example: Their cousin showed them some rare photographs.
(Active Voice) They were shown some rare photographs by their cousin.
(Passive Voice) The subject of the given sentence is 'Robin'.
The object of the given sentence is 'The marble.
The subject will be put in place of the object and the object will be put in place of the subject.
And 'rolled' will be changed into 'was rolled'. Lastly, the preposition 'by' will be added.

The given sentence is in the active voice. We have to change the sentence into passive form.
The given sentence is written in 'present perfect tense.'
The structure of these kinds of sentences is:
Active Voice: Subject + have/has + V3 + Object.
Passive Voice: Object + have/has + been + V3 + by (preposition) + Subject.
Let’s see another example:
Active voice: I have written this instruction only for visitors.
Passive voice: This instruction has been written by me only for visitors.
The subject of the given sentence is 'Shalu' and the object of the given sentence is 'new copies of the album.'
So, in the passive voice, the position of ‘subject’ and ‘object’ will be interchanged.
Also here, 'has ordered' will be changed into 'have been ordered'.
Correct Sentence: New copies of the album have been ordered by Shalu.

The given sentence is in the active voice. We have to change the sentence into passive form.
The given sentence is written in 'present perfect tense.'
The structure of these kinds of sentences is:
Active Voice: Subject + have/has + V3 + Object.
Passive Voice: Object + have/has + been + V3 + by (preposition) + Subject.
Let’s see another example:
Active voice: The minister has called an emergency meeting.
Passive voice: An emergency meeting has been called by the minister.
The subject of the given sentence is 'He' and the object of the given sentence is 'the movie'.
So, in the passive voice, the position of ‘subject’ and ‘object’ will be interchanged.
Also here, 'has downloaded' will be changed into 'has been downloaded'.
'He' will be changed into 'him.'

In the passive voice of simple future tense, the auxiliary verb shall / will is used with be and past participle of a verb.
The object of the sentence becomes the subject.
Here action will be done on the object in the future.
Formation:
Active: Subject + will/shall + V1 + object.
Passive: Object + will/shall + be + V3 + by + subject.
Thus, the correct passive form of the given sentence is option 3.