Rewrite the sentence in indirect speech.
Sunder said, "I will go to my sister's house today."

Correct option is D

The correct option is (d) Sunder said that he would go to his sister's house that day.
Tense change: "Will go" (simple future) changes to "would go" in indirect speech.
Pronoun change: "I" becomes "he" in indirect speech.
Time clause change: "Today" changes to "that day" in indirect speech.
Reporting verb change: "Said" remains the same.
Corrected sentence: Sunder said that he would go to his sister's house that day.