thE pAssAgE is mAinly ABout ______.
A．how AmEriCAn gooDs ArE proDuCED
B．how AmEriCAn ConsumErs Buy thEir gooDs
C．how AmEriCAn EConomiC systEm works.
D．how AmEriCAn BusinEssmEn mAkE thEir proFits.