You Notice That Your Computer Is Running Slow and Decide

You notice that your computer is running slow and decide to reboot the computer to see if that will fix the problem. During the reboot, you notice that the amount of RAM shown during the RAM count is not the same as it was the day before.
What might cause this problem?

A) CMOS battery is failing.
B) RAM module has become unseated.
C) CMOS RAM has become corrupt.
D) System is overheating.