问题详情

Which of the following inferences CANNOT be made from the information in the first paragraph？
A．Calhoun"s experiment is still considered important today.
B．Overpopulation causes pathological behavior. in rat populations.
C．Stress does not occur in rat communities unless there is overcrowding.
D．Calhoun had experimented with rats before.请帮忙给出正确答案和分析，谢谢！