CompTIA A+ Core 2 Question G-79

A user has an external hard drive which they forget to unplug before booting their machine. Each time this happens, an error shows on the screen which states “Boot sector missing reboot to try again.” Which of the following would be the BEST way to resolve this?

A. Change BIOS options to remove floppy drive from the boot order
B. Change BIOS options to remove USB device from the boot order
C. Change BIOS options to remove CD drive from the boot order
D. Set the SATA setting in BIOS to AHCI from IDE