Select the most appropriate option to substitute the bracketed segment in the given sentence. If there is no need to substitute it, select 'no substitution required'.
(I wouldn't cross him if I was you, not) if you value your life.

A

No substitution required

B

I wouldn't has crossed him if I were you, not

C

I wouldn't had crossed him if I were you, not

D

I wouldn't cross him if I were you, not