问题详情

The third paragraph mainly tells us that__________。 查看材料
A.a network of centers has been quite effective in reducing suicide
B.a network of centers has been quite successful in reducing suicide
C.people are making efforts to help those who tend to commit suicide and in a way，they are successful
D.in the United States， 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！