ConsumErs ArE ConCErnED ABout thE ChAngEs in thE pACkAgE sizE, mAinly BECAusE ______.
A．thEy hAtE to sEE Any ChAngEs in things thEy ArE FAmiliAr with
B．thE unit priCE For A proDuCt oFtEn risEs As A rEsult
C．thEy hAvE to pAy For thE Cost oF ChAnging pACkAgE sizEs
D．this EntAils An inCrEAsE in thE Cost oF pACkAging