Question

Which of the following is an interrogative sentence?

A.) She isn't telling him where she is going.
B.) Please don't go.
C.) They questioned where he was going.
D.) Where are you going?

Answer 1

D.) where are you going?

Interrogative sentence ends with a question mark. Hope this helps, :)

Answer 2

D.) Where are you going?

should be correct because it is asking a question (interrogating)