thE pErioD oF ADolEsCEnCE is muCh longEr in inDustriAl soCiEtiEs BECAusE ______.
A．thE DEFinition oF mAturity hAs ChAngED
B．thE inDustriAlizED soCiEty is morE DEvElopED
C．morE EDuCAtion is proviDED AnD lAws AgAinst ChilD lABor ArE mADE
D．CErEmoniEs For ADolEsCEnCE hAvE lost thEir FormAl rECognition AnD symBoliC signiFiCAnCE