E. what component must be compatible with every other component of the computer?

The correct answer: The motherboard

The motherboard which is a piece of technology which has most of the electronics of a personal computer is (usually) found at the center most part of a Central Processing unit (CPU).

The motheboard needs to be compatible with all the components found in the Central Processing Unit because almost all the important components is connected to it. Just imagine if the power which the power suppy supplies to the motherboard is inadequate due to electrical incompatibility, do you think the Central processing unit will work? It won't. As a matter of fact if you turn on the CPU, it will just switch off on itself in just a few seconds.