Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.Air pollution became very serious in recent years d
Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.
Air pollution became very serious in recent years due to human activity.
A. became
B. serious
C. due to
D. activity