The word "benevolent' ( Line 3, Para. 3 ) means ______.

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

A．had followed
B．would follow
C．follow
D．have followed