Giá trị pH của dung dịch HCl 0,001M là

A. 3. 

B. 2.

C. 1.

D. 4.

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

A survey was _____ to study the effects of smoking on young adults.

A. commented

B. filled 

C. conducted 

D. carried