Which device is primarily responsible for managing data input and output in a computer?

The microprocessor is primarily responsible for managing data input and output in a computer because it acts as the central processing unit (CPU), executing instructions and processing data. It interprets and manages the information that comes from input devices like keyboards or mice and directs output to devices such as monitors or printers. The microprocessor handles all computational tasks, controls other components, and orchestrates the flow of data within the system.

The other choices relate to different functions within a computer system. The motherboard connects all components, ensuring communication between the microprocessor, memory, and other peripherals. The power supply unit converts electricity from an outlet into usable power for the computer's components but does not manage data processing. Storage devices hold data and programs but do not perform the processing and management functions inherent to the microprocessor.