Choose the best answer. Alex could have rebutted his boss' opinion, but he was too tired. Alex could have rebutted his boss's opinion, but he was too...

Choose the best answer.

A. Alex could have rebutted his boss' opinion, but he was too tired.

B. Alex could have rebutted his boss's opinion, but he was too tired.

C. Alex could have refuted his boss' opinion, but he was too tired.

D. Alex could have refuted his boss's opinion, but he was too tired.