Concept:Every hardware component has a primary function, and the correct answer matches each device with its main role.
Explanation:A mouse is an input device. It is used to select, point, and control items on the screen. Therefore, the association "Mouse to input" is correct.
A monitor is an output device. It displays information on the screen, but it cannot print documents. Therefore, "Monitor to print" is not correct.
The CPU is the processing unit of the computer. It executes instructions and performs calculations, but it is not mainly used for storage. Therefore, "CPU to storage" is not correct.
A hard disk is a storage device. It saves data and files for later use, but it does not process data. Therefore, "Hard disk to processing" is not correct.
Thus, the only valid match in the given options is between the mouse and its input function.
Answer:Option A: Mouse to input