Mark the letter A, B, C, or D on your answer sheet...

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

On a__________of 1 to 10, in these subtropical desert regions the risk of desertification is 7.6 according to the study.

A. rate

B. scale

C. grade

D. rank