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

Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the word or phrase that is CLOSEST in meaning to the underlined part in each of the following questions.
According to scientists, it is possible that another Ice Age will soon be upon us.

A. in the near future

B. undoubtedly

C. some day

D. now