A User's Computer Will Not Boot, and the Screen Shows

Multiple Choice

A user's computer will not boot, and the screen shows the following error: no OS found . During the last week, the computer has been performing slower than normal, and the user has been experiencing a BSOD. Which of the following will MOST likely resolve the issue?

A) Run the DiskPart command
B) Replace the hard drive
C) Install more RAM
D) Upgrade to a faster CPU