Mohan said, "We shall go to see the Taj in the moonlit night":

Original Sentence (Direct Speech):
Mohan said, "We shall go to see the Taj in the moonlit night."

Step-by-step Conversion:
1. Sentence Type: This is a statement, so we use “said that…” in indirect speech.
2. Pronoun Change:
“We” becomes they (when the speaker is not including the listener).
3. Tense Change:
“Shall” changes to should in indirect speech (future tense changes when reporting verb is in past tense).
4. Time & Place:
No change needed for "in the moonlit night" as it's already specific and doesn't fall under usual time changes like "today → that day".

Correct Sentence:
Mohan said that they should go to see the Taj in the moonlit night.

Correct Answer: Option D

Why other options are incorrect:
Option A: Uses “we shall” — ❌ Wrong pronoun and tense not changed.
Option B: “told that” — ❌ We use “told” only when an object (person) is mentioned. Also “shall” not changed.
Option C: Uses “told that” — ❌ Same issue as above. Also unclear if “we” includes listener or not, and “we” not changed to “they”.

Final Answer: Option D – Mohan said that they should go to see the Taj in the moonlit night.