Mark the letter A, B, C, or D to indicate the sentence that best combines each pair of sentences in the following questions.
He failed his driving test the first time. As a result, he took it again.
A. He failed his driving test the first time and so he therefore took it again.
B. He failed his driving test the first time and he therefore took it again.
C. He failed his driving test the first time which he took it again.
D. Failing his driving test the first time and he therefore took it again.