What is the main idea of the news item？A．The Renren"s achievement in the international mar

What is the main idea of the news item？

A．The Renren"s achievement in the international markets.

B．The popularity of the social network websites.

C．The history of Renren and its present situation.

D．The shares of Renren have risen a lot recently.

请帮忙给出正确答案和分析，谢谢！