问题详情

The third paragraph mainly tells us that __________.
A) a network of centers has been quite effective in reducing suicide
B) a network of centers help the callers to realize that suicide is a common social problem
C) people are making efforts to help those who tend to commit suicide and in a way, they are successful
D) in the US, people who want to commit suicide call a network of centers to get help请帮忙给出正确答案和分析，谢谢！