The correct answer is: B. Buses
A bus is a set of parallel electrical conducting lines that allow different components on the motherboard of a PC processor unit to communicate with each other. Buses are typically used to connect the CPU, memory, and other major components on the motherboard.
A conductor is a material that allows electricity to flow through it. Conductors are typically made of metals, such as copper or aluminum.
A connector is a device that joins two or more electrical conductors together. Connectors are typically used to connect cables to devices, such as the power supply to the motherboard.
Connectively is not a technical term. It may be used to refer to the act of connecting two or more things together, but it is not a specific type of connection.