Mark the letter A, B, C, or D on...

Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions.
The coach explained the regulations at length to make sure that none of his players would become violators.

A. at last     

B. at least    

C. in detail 

D. in short