What is the primary role of a power supply unit in relation to computer components?

The primary role of a power supply unit (PSU) is to convert electrical current from the wall outlet into a usable form of power for the various components of a computer. This involves converting alternating current (AC) from the outlet into direct current (DC), which is what computer components, like the motherboard, processor, and storage devices, require to operate.

In addition to conversion, the PSU is responsible for distributing that power to the different components, ensuring they receive the correct voltage and current needed to function properly. This distribution is crucial for the stability and reliability of the entire system.

Though other components may play roles in regulating voltage or cooling, the primary job of the power supply is centered around conversion and distribution of power, making option B the correct choice.