问题详情

What is the main idea of the news item？
A．The Citigroup has been worst hit by the international credit crisis.
B．The Citigroup has already started to reduce the size of its business.
C．The Citigroup has encountered great losses in the credit crisis.
D．The Citigroup has decided to take measures to deal with great losses.请帮忙给出正确答案和分析，谢谢！