Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines of each pair of sentences in the following questions.His parents are away on holiday....

A. As long as his parents are at home, they will be able to help him.

B. He wishes his parents were at home and could help him now.

C. If his parents are at home, they can help him now.

D. If only his parents had been at home and could have helped him.