My just shows the question, but no answers. Anyone know why? Or how to fix it? please assist

answer; correction;

i guess the correct option is letter a.

use contrasting font sizes, but the same font style

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)