L2004/12-1-11

The average cost of groceries will rise again next month. Consequently, butter and eggs can be expected to cost more next month.

The flawed reasoning parallels the reasoning in which one of the following?

C The average amount of time spent by people younger than 20 in watching tv has recently risen rapidly. Therefore, the amount of time fourth graders spend watching tv must have risen recently.

觉得答案Ｃ有问题，因为the average cost of groceries中包含butter and eggs;但是，people younger than 20却与fourth graders是不相容的两类．

还请达人释疑．