The structures for both the active and passive forms for future indefinite tense are given below:
Active form- Subject + shall/will + V1 + Object
Passive form- Object + shall/will + be + V3 + by + subject
Example:
She will play football. (active)
Football will be played by her. (passive)
Following this structure in active voice form, we get the 2nd option as the correct answer.

In Active Voice, a sentence emphasizes the subject, performing an action.
In Passive Voice, a sentence emphasizes the action or the object of the sentence.
The given sentence is in the active voice and 'her failure' is the subject and 'us' is the object.
When we convert this sentence into passive voice, the subject 'her failure' of the active voice becomes the object, the object 'us' becomes the subject 'we'.
The passive format "were + V3 (surprised)" should be used.
This is the active and passive voice rule for the past simple tense.
Hence, the correct answer is option 2.

The given sentence is In Passive Voice. As per the question we have to change it into Active Voice.
The structure of transformation as follows: Subject+V2+Object.
(Active Voice) Subject (objective case)+was/were+V3+Object (Subjective Case).
(Passive Voice) 'He' will be changed into 'him'.
'Was given' will be changed into 'gave' as per the structure.
Hence, by applying the above structure in the given sentence we find that the correct answer is Option 2.

The given sentence is in The Passive Voice.
As per the question we have to change it into Active Voice.
The process of transformation as follows: 'One' will be added.
Because the given sentence has no subject it is a general statement that is why true everywhere.
Therefore, 'one' is used as a subject.
'Cannot be achieved' will be changed into 'cannot achieve' in the active voice.
The rest of the sentence will be written as it is.