Walk steadily lest you . . . . . . . . stumble.

A. would

B. should

C. could

D. ought to

Answer: Option B

Solution(By Examveda Team)

The conjunction lest means 'for fear that' or 'in order to avoid'. It is followed by something the speaker or subject thinks should be avoided. Thus, should is the right answer since stumbling is something that needs to be avoided.