Mark the letter A, B,...

Câu hỏi: Mark the letter A, B, C or D on your answer sheet to indicate the most suitable response to complete each of the following exchanges.

A. Very. Undersea life is being strongly contaminated. 

B. Very. Undersea life is fascinating.

C. Not any. Undersea life is too expensive. 

D. Well, things are much different, now.