The piece of hardware that contains the circuitry that processes the information coming in to the computer and tells the other hardware what to do it called the a. hard drive b. operating system c. central processing unit d. input device

The answer is C. Central processing unit (or CPU).

The trick is in the name, central processing unit :)

the answer to your question would be something called hertz. the unit of measurement called a hertz, which is one cycle per second, is used to measure clock speed. within one cycle, your computer processes, refreshes, or updates itself to the changes that it is going through. in the case of computer clock speed, one hertz equals one tick per second. the clock speed of computers is usually measured in megahertz (mhz) or gigahertz (ghz)