Question

the __, or microprocessor, is the main processor of a computer.
a system unit
b firmware
c cpu
d ram

Explanation:

The Central - Processing Unit (CPU), also known as the microprocessor, is the main processor of a computer. It executes instructions of a computer program. The system unit is the case that contains the computer's main components. Firmware is software that is embedded in a hardware device. RAM (Random - Access Memory) is a type of computer memory that can be accessed randomly.

Answer:

C. CPU