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.
Juan Manuel Santos was awarded the Nobel Peace Prize 2016 for his resolute efforts to bring the country’s more than 50-year-long civil war to an end.

A. determined

B. sure

C. original

D. certain