What is the primary function of a computer's motherboard?

The primary function of a computer's motherboard is to connect all components of a computer. The motherboard acts as the main printed circuit board (PCB) and serves as the central hub through which all other components communicate. It allows the CPU, RAM, storage devices, and various expansion cards to interact with each other efficiently.

The motherboard houses the chipset, which manages the data flow between the processor, memory, and peripheral devices. It provides the necessary sockets and connections for essential components such as the power supply, disk drives, and input/output devices. This integration is crucial for the overall functionality of the computer, making the motherboard an indispensable part of any computer system.

The other options, while related to computer functions, describe roles that specific components fulfill rather than the primary role of the motherboard itself. For instance, data storage is typically handled by hard drives or SSDs, the operating system is run by the CPU and stored in memory, and graphical processing is managed by dedicated graphics cards or integrated graphics within the CPU. Thus, option A effectively encompasses the motherboard's essential role in system connectivity and integration.