对于数据：80，88，85，83，84．①这组数据的平均数是84；②这组数据的众数是85；③这组数据的中位数是84；④这组数据方差是36．下列说法中正确的有（　　）

A．1个

B．2个

C．3个

D．4个

— Could you buy me a MP3 like this, Uncle?

— Sure. I will buy you           one than this, but           this. [ ]

A. a cheaper; as nice as

B. a better; better than

C. a worse; as nice as

D. a more expensive; better than