Which of the following is the most challenging for the work of counseling services？A．More

Which of the following is the most challenging for the work of counseling services？

A．More and more college students suffer from mental-health problems.

B．Though many students have mental-health problem, few of them seek counseling.

C．They have to keep an eye out for students who might pose a risk to others.

D．Persuade people into believing what"s made into the media isn"t very popular.

请帮忙给出正确答案和分析，谢谢！