Mark the letter A, B, C, or D on y...

Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions

A. Though the leader failed to explain the cause of the problem, he did not offer any solutions.

B. The leader failed to explain the cause of the problem so he did not offer any solutions.

C. The leader failed to explain the cause of the problem nor did he offer any solutions.

D. The leader failed to explain the cause of the problem because he did not offer any solutions.