The coffee was not strong. It didn't keep us awake...

Câu hỏi: The coffee was not strong. It didn't keep us awake. 

A. The coffee was very strong, but it couldn't keep us awake.

B. The coffee was so strong that we couldn't sleep.

C. The coffee was not strong enough to keep us awake.

D. We was kept awake because the coffee was strong.