Answer : 4. "He said that he would be there the next day."
Explanation :

The correct indirect speech of the sentence "He said, 'I will be there tomorrow.'" is:

D) He said that he would be there the next day.

Explanation:

When converting direct speech to indirect speech, several changes occur:

Change in Pronoun:

"I" changes to "he".

Change in Verb Tense:

"will" changes to "would" (as it is in the future tense and the reporting verb "said" is in the past tense).

Change in Time Expression:

"tomorrow" changes to "the next day".

Therefore, the sentence "He said, 'I will be there tomorrow.'" in indirect speech is correctly changed to "He said that he would be there the next day."