in jApAn, A most CompEtitivE soCiEty, with strongEr _______ thAn ours, ChilDrEn ArE rEADy to tEst thEir limits EvEry DAy in mAny FiElDs, inCluDing musiC.
A．ConFinEmEnt
B．prinCiplE
C．ConvEntion
D．DisCiplinE