The correct answer is A. Input.
An input device is a piece of equipment that receives information from a user and sends it to the computer. Some common input devices are keyboards, mice, and touchscreens.
A CPU, or central processing unit, is the main part of a computer that carries out instructions. It is responsible for processing data and controlling the other parts of the computer.
Memory is a storage device that stores data and instructions that the CPU needs to access quickly. There are two main types of memory: RAM (random access memory) and ROM (read-only memory). RAM is temporary memory that is erased when the computer is turned off. ROM is permanent memory that is not erased when the computer is turned off.
Storage is a device that stores data and instructions that the CPU does not need to access quickly. There are many different types of storage devices, including hard drives, solid-state drives, and optical drives.
I hope this helps!