Mark the letter A, B, C, or D to indicate the sentence that best combines each pair of sentences in the following questions The president failed to explain the cause of the crisis....

A. The president failed to explain the cause of the crisis, nor did he offer any solutions

B. The president offered some solutions based on the explanation of the cause of the crisis

C. Not only did the president explain the cause of the crisis, he also offered solutions

D. Although the president explained the cause of the crisis, he failed to offer any solutions