Which of the following statements about West Nile virus is CORRECT？A．It is mosquitoes that

Which of the following statements about West Nile virus is CORRECT？

A．It is mosquitoes that spread the virus.

B．Most people die in two weeks after contracting.

C．The highest number of cases occurred in 2004.

D．Staying away from crowds can provide good protection.

请帮忙给出正确答案和分析，谢谢！