Marginal utility theory predicts that when income increases a

A、person'stotalutilitywillnotchange.
B、personmightincreasetheconsumptionofsomenormalgoodsanddecreasetheconsumptionofothernormalgoods.
C、person'sconsumptionofnormalgoodswillincrease.
D、Noneoftheaboveanswersiscorrectbecausemarginalutilitytheorydoesnotaddresshowdemandchangesinresponsetochangesinincome.