Which of the following italicized phrase is INCORRECT？（2011)A．The city is now ten times it

Which of the following italicized phrase is INCORRECT？(2011)

A．The city is now ten times its original size.

B．I wish I had two times his strength.

C．The seller asked for double the usual price.

D．They come here four times every year.

请帮忙给出正确答案和分析，谢谢！