The cohort effect describes:

a$.$ the effect of demographic characteristics in analyzing purchase habits, product usage rates, and brand preference.

b$.$ why members of the same psychographic group decide to vote the same way and have a lot of similarities in their choices.

c$.$ the tendency of members of a generation to be influenced and bound together by events occurring during their key formative year

d$.$ how Generation X uses its financial power to influence product trends, and gets closely followed by the marketers.