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 correct answer to each of the following questions
To solve this problem, it is advisable________

A. a drastic measure to be adopted

B. that to adopt a drastic measure

C. that a drastic measure be adopted

D. that a drastic measure is adopted