capacity对应

A.being able to perform any gainful employment

B.to annul or cancel an act， particularly a statement， document or promise， as if it no longer existed.Thus， a person can revoke a will or revoke an offer to enter into a contract， and a government agency can revoke a license.

C.referring to a statute， contract， ruling or anything which is null and of no effect.

D.the act of failing to perform one's agreement， breaking one's word， or otherwise actively violating one's duty to other.

正确答案：being able to perform any gainful employment