thE pArAgrAph Following thE pAssAgE most likEly DisCussEs ______.
A．unusuAl wAys to ADvErtisE proDuCts
B．typEs oF pAymEnt plAns For sErviCE
C．thEoriEs ABout how proDuCts AFFECt DiFFErEnt lEvEls oF soCiEty
D．how CErtAin ElEmEnts oF A priCE "pACkAgE" inFluEnCE its mArkEt vAluE