Punctuation

Directions: The following question consists of two sentences marked (A) and (B). Read both the sentences carefully and mark the one that has correct punctuation.

Mark your answer as

(A) If only A is correct
(B) If only B is correct
(C) If both A and B are correct.
(D) If both A and B are wrong.

(A) Do you know how to swim?
(B) Do you know how to swim.