Which of the following is an assumption on which the argument depends? A. The cited studies were conducted by academic researchers adhering to established standards of scientific research. B. Students who have been punished by not having playtime outdoors are less likely to misbehave again in the future. C. Well-behaved students do not share a particular trait, such as a desire to socialize with other wellbehaved students, that leads them to play outdoors more frequently. D. The principal's suggested policy will not be protested vehemently by local parents who want their children to play outdoors. E. Playtime outdoors has not been demonstrated to have positive effects on the physical development of schoolchildren.