The correct answer is: C. make the most efficient use of the hardware.
An operating system is a software that manages computer hardware and software resources and provides a platform for running application programs. It is the most important program that runs on a computer, and without it, no other programs can run.
The primary purpose of an operating system is to make the most efficient use of the hardware. It does this by managing the computer’s resources, such as the CPU, memory, and storage. It also provides a platform for running application programs, which allows users to interact with the computer.
Option A is incorrect because the primary purpose of an operating system is not to make computer easier to use. This is a secondary purpose of an operating system, but it is not the primary purpose.
Option B is incorrect because the primary purpose of an operating system is not to keep system programmers employed. This is a benefit of having an operating system, but it is not the primary purpose.
Option D is incorrect because the primary purpose of an operating system is not to allow people to sue the computers. This is not a function of an operating system.
Option E is incorrect because the primary purpose of an operating system is to make the most efficient use of the hardware.