givEn thAt mArkEts ArE EFFiCiEnt, whiCh oF thE Following is lEAst likEly to CAusE An ACtivEly mAnAgED mutuAl FunD to unDErpErForm An inDEx FunD
A．

A、tAxEs.

B．

B、inFErior stoCk sElECtion.

C．

C、mAnAgEmEnt ExpEnsEs.