A potential factor affecting scientists in their efforts to control the overgrowth of worl

A potential factor affecting scientists in their efforts to control the overgrowth of world population is that

A．state administrators do not have confidence in their work.

B．humanists usually cannot cooperate well with them.

C．they haven"t been trained to consider social effects of their work.

D．they do not have enough time to tackle the problem.

请帮忙给出正确答案和分析，谢谢！