A system powers on, begins POST, displays the BIOS version information and then hangs with

A system powers on, begins POST, displays the BIOS version information and then hangs with the error message ‘Error loading operating system’. Which of the following is MOST likely the cause of this issue? （）

A. A virus has infected the system

B. Corrupted BOOT.INI file

C. Corrupt MBR

D. Boot sector corruption