IX. Mark the letter A, B, C, or D to indicate the sentence that best combines each pair of sentences in the following questions.
I didn't understand his instructions. I asked him to repeat what he had said.
A.I didn't understand his instructions because I asked him to repeat what he had said.
B.I didn't understand his instructions, and I asked him to repeat what he had said.
C.I didn't understand his instructions, for I asked him to repeat what he had said.
D.I didn't understand his instructions, so I asked him to repeat what he had said.

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