The correct answer is C. Microprocessor.
A microprocessor is a computer processor that incorporates the functions of a computer’s central processing unit (CPU) on a single integrated circuit, or a small number of integrated circuits. The microprocessor contains all, or most of, the central processing unit functions of a computer, and is a multipurpose, programmable device that accepts digital data as input, processes it according to instructions stored in its memory, and provides results as output.
The term “Pentium” is a brand name for a series of x86 microprocessors developed and marketed by Intel. The first Pentium processor was released in 1993, and the Pentium line has been through several generations since then. The Pentium is one of the most popular microprocessors in the world, and is used in a wide variety of computers, from personal computers to servers.
The other options are incorrect because they are not related to microprocessors. A mouse is a pointing device that is used to control the cursor on a computer screen. A hard disk is a storage device that is used to store data on a computer. A DVD is a digital optical disc storage format that was developed to store large amounts of data.