Four friends, Edwin, Fred, Gary and Howard, were playing together when one of them broke a vase. The teacher asked,~"Who is the culprit?"  \textbf{Both Edwin and Howard said, "Not me."}  \textbf{Fred said, "Howard broke the vase."}  \textbf{Gary said, "Fred is the culprit."}  If only one of four boys was lying, who broke the vase? 
选项为:A:Edwin  B:Howard  C:Fred  D:Gary  请回答其中一个选项.