B is the answer but I am not sure
Lack, want, need, require as verbs all stress the absence of something desirable, important, or necessary. Lack means to be without or to have less than a desirable quantity of something: to lack courage, sufficient money, enough
The word that fit the definition would be : A. Suffix
affix is placed at the end of the word
Prefix is used before the word while root is used in the middle of the word
hope this helps
