The correct answer is: B. Buses
Buses are sets or parallel electrical conducting lines that link together different components on the motherboard of a PC processor unit. They allow data and instructions to be transferred between the components.
A conductor is a material that allows electricity to flow through it. Copper is a good conductor of electricity, which is why it is often used in electrical wiring.
Connectors are devices that join two or more electrical components together. They can be used to connect wires, cables, or other components.
Connectivity is the ability to connect to something else. In the context of computers, connectivity refers to the ability of a computer to connect to other devices, such as a network or the internet.
None of these is the correct answer because it does not specifically refer to the lines that link together different components on the motherboard of a PC processor unit.