Mark the letter A, B, C, or D on your answer sheet to indicate the cor

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.    

Overpopulation in big cities has SEVERELY affected the air and water quality.

• A. A. insignificantly
• B. B.commonly
• C. C. seriously
• D. D. largely

severely = seriously = largely = nghiêm trọng
commonly = phổ biến
insignificantly = không đáng kể
=> A