2009年我国启动“家电下乡”工程，国家对购买家电补贴13%，若某种品牌彩电每台售价a元，则购买时国家需要补贴（　　）

A．a元

B．13%a元

C．（1-13%）a元

D．（1+13%）a元

Alex has finally become an astronaut, __________all his family members think is his dream career.

A．which

B．who

C．that

D．whom