Don't wait for people to be friendly,show them ___a friendly

Don't wait for people to be friendly,show them ___a friendly person you are.A.what B.how C.when
Don't wait for people to be friendly,show them ___a friendly person you are.
A.what B.how C.when
它答案是选A,但我不知道为什么要选A,请说说原因.还有,有些网友说从：1、what a friendly person you are.2、how friendly you are.这两句话可以知道选什么,但又有人说第二句应是 how friendly a person you are.到底how friendly you are.和 how friendly a person you are.哪句才是正确的,