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 sentence that is closest in meaning to each of the following questions.

A. It is believed that air pollution is mainly to blame for burning fossil fuels. 

B. It is believed that burning fossil fuels is held responsible for air pollution. 

C. Burning fossil fuels is believed to result from air pollution. 

D. Burning fossil fuels is believed to have caused high levels of air pollution.