What is the main idea of the news item？A．Internet industry has reduced the unemployment ra

What is the main idea of the news item？

A．Internet industry has reduced the unemployment rate.

B．College students have changed job hunting methods.

C．Help-wanted ads can be posted on the net.

D．It"s easier for college students to find jobs.

请帮忙给出正确答案和分析，谢谢！