Dion's Mother Called and Said That Her Computer Would Not

Dion's mother called and said that her computer would not run Microsoft Word anymore.Which of the following best explains why her computer would not be running Microsoft Word anymore?

A) There's a problem with the utility software that runs the computer.
B) There's a problem with operating system,which manages the complete operation of the computer and lets you interact with it,so when his mother wanted to run Microsoft Word,it would have started the program.
C) There's a problem with the app,which manages memory on your device.
D) Flash drives are needed to run word processing programs,so when his mother wanted to run Microsoft Word,she would have needed a flash drive.