Out of the given options, choose the sentence, which, in your view, is the most grammatically and structurally correct. Please note that the meaning or the context of the sentence must not change

Options

A. You oughtn't take care while walking on that ledge lest you fall.
B. You mustn't take care while walking upon that ledge lest you fall.
C. You should take care while walking in that ledge lest you fall.
D. You must take care while walking on that ledge lest you should fall.