The order to remove the parts of a system would be c) Motherboard, expansion cards, drives / power supply.
Why is the order best ?
The motherboard is the central circuit board of the computer, and it connects all of the other components together.
The expansion cards are daughterboards that plug into the motherboard and provide additional functionality, such as graphics processing or networking .
The drives are storage devices that hold your data, and the power supply provides power to all of the components in the computer. This is the order in which you would typically remove parts from a computer system.