Question

Which one of the following sentences is interrogative?
A. I passed the entrance examination!
B. What will you do when the well goes dry?
C.The canned tuna is in the pantry.
D. Be so kind as to feed my dog.

Answer 1

B. What will you do when the well goes dry?
This is an interrogative sentence because its asks a question.

Answer 2

An interrogative sentence asks a question, or interrogates something.

Here, we can look for the question mark, which is '?'. 

Answer: B. What will you do when the well goes dry?