The correct answer is C. Microprocessor.
A microprocessor is a small, integrated circuit that contains all, or most of, the central processing unit (CPU) of a computer. It 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.
A micro chip is a small piece of semiconductor material on which integrated circuits are etched. Micro chips are used in a wide variety of electronic devices, including computers, cell phones, and automobiles.
Execute is a verb that means to carry out or put into effect. In the context of computers, execute can mean to run a program or command.
Select is a verb that means to choose or pick out. In the context of computers, select can mean to choose a file or folder, or to select a text or object.