Which of the following has the highest processing speed?

The correct answer is C. 4.4 GHz. GHz means gigahertz, or billions of cycles per second, while MHz means megahertz, or millions of cycles per second. Therefore, any GHz value is much faster than a MHz value. Between 3.1 GHz and 4.4 GHz, 4.4 GHz is higher.

Exact Extract/Reference: The CompTIA Tech+ Study Guide states that IBM’s first PC ran at 4.77 MHz, which is 4.77 million cycles per second, while modern processors operate at “billions of cycles per second, or gigahertz (GHz).” It also states that, generally speaking, faster processor speed is better.