下列设备组中，只有______组中的设备都是输入设备。 Of the following equipment groups, only the equipment in the ___ group are input devices.

A.键盘、扫描仪、显示器； Keyboard, Scanner, and Display;

B.键盘、鼠标器、绘图仪； Keyboard, Mouse, and Plotter;

C.键盘、鼠标器、扫描仪； Keyboard, Mouse, and Scanner;

D.显示器、扫描仪； Mouse, Monitor, and Scanner;