小科想购买一个电热水壶，已知他家中电路电压是220V、室内插座额定电流是5A，则下列规格的电热水壶适合他家的是（ ）                                                                                                                                                                                   

选项	额定电压/V	额定功率/W
A	220	1500
B	220	800
C	120	1500
D	120	800

A、A

B、B

C、C

D、D