Whichstatements,wheninsertedattheindicatedpositioninthefollowingcode,willcausearuntimeexce

Whichstatements，wheninsertedattheindicatedpositioninthefollowingcode，willcausearuntimeexceptionwhenattemptingtoruntheprogram？（）classA{}classBextendsA{}classCextendsA{}publicclassQ3ae4{publicstaticvoidmain（Stringargs[]）{Ax=newA（）；By=newB（）；Cz=newC（）；//insertstatementhere}}

A.x=y；

B.z=x；

C.y=（B）x；

D.z=（C）y；

E.y=（A）y；