Choose the most appropriate option which best expresses the same sent…

The correct answer is Option (2) → He asked Sita when the next train was.

Wh-question in indirect speech:

Change	Direct	Indirect	Why
Reporting verb	said	asked	“Said” becomes “asked”, because the words are a question.
Person addressed	Sita,	asked Sita	The person addressed, “Sita”, becomes the object of “asked”.
Word order	when is the next train	when the next train was	The question becomes a statement, subject + verb: “the next train was”.
Tense change	is	was	“Is” becomes “was”, because the reporting verb is in the past.
Full sentence	He said, “Sita, when is the next train?”	He asked Sita when the next train was.

Linking word: the question word when itself joins the clause. No "if" or "that".

Example: She said, “Ravi, where is your bag?” → She asked Ravi where his bag was.

Why the Other Options are Incorrect?

Option 1: He said to Sita when the next train was. — Incorrect. "said to" does not report a question. It must change to "asked".

Option 3: He asked Sita about the next train. — Incorrect. It is vague: it does not report that he asked when the train was.

Option 4: He asked when the next train is. — Incorrect. Sita is left out, and "is" is not changed to "was" after the past reporting verb.