The correct answer is C. power.
Storage on a PC allows you to store files until something erases it, but memory loses its contents whenever its power is lost. This is because memory is volatile, which means that it requires power to maintain its contents. When the power is turned off, the memory loses its contents and all of the data stored on it is erased.
Static and disk space are not the correct answers because they do not affect the contents of memory. Static is a type of electricity that can build up on objects, but it does not have any effect on memory. Disk space is the amount of storage available on a hard drive, but it does not affect the contents of memory.
None of the above is not the correct answer because it does not include the correct answer.
I hope this helps!