Critical Reasoning Questoin - Sports vs academic

Experts have suggested that schools need to give greater significance and allocate more time to sports-related activities, rather than focusing only on academics. They argue that physical activity is intrinsic to a growing child's overall development. While this point is certainly valid, the average twelve-year-old already goes through a sport schedule of four hours a week as part of the school schedule, and it is surely unnecessary to prolong the time allotted to physical activity.

Which of the following is an assumption on which the authors argument depends?

a. All the various types of sports that twelve-year-olds usually play are equally beneficial.
b. A well-organized athletics schedule helps children excel in their chosen sport.
c. Sports activities are as important as academic work.
d. Most schools allot time to sports and related activities that does not vary much from the average.
e. The skills that children learn during athletic activities cannot be compared with those that they develop during academic work.