[求助]一个逻辑题

the sense of delayed gratification , of working now for later pleasure , has helped shape the economic behavior of our  society. however , that sense is no longer nurtured as consistently in our children as it once was. for example, it used to take a bit of patience to put together the  toys that  children got in cereal boxes, now the toys come from the boxes whole.

which of the follwing is an assumption of the passage above?

a) the toys in cereal boxes have changed partly because the economic conditions of our society  have improved.

b) the influence of fpromotion grmmickes on the economic behavior of our society has increased over the years.

c) the toys that used to come in cereal boxes were put together by the same children who played with them.

d) part of the pleaseure of any toy lies in putting the toy together before playing with it

e) Today 's children do not expect a single toy  to  provide pleasure for a long period of time.

能帮忙解释逻辑关系吗，答案C。谢谢

楼主如果能在标题里注下题目的出处，那就会有多些朋友回复，也方便后来朋友查询同样问题。

这题我认为是这样的：

说delayed gratification现在很少用了，举了麦片盒子里附带的玩具原来是要小孩自己装的，现在就是整个玩具这个例子来说明delayed gratification很少用了。题目要找出架设，一般情况下，假设如果不成立，原题的推论也不能成立。C说了玩那个玩具的小孩也就是装玩具的小孩。如果C不成立，就不会存在delayed gratification这一说。因为这本来就必须是同一个人身上发生的，否则不具比较性。

希望我说明白了。。。