Isabel Received a Message on Her Computer That Appeared to Be

Isabel received a message on her computer that appeared to be from the FBI.It informed her that her computer has been locked and she would need to pay a fee to retrieve her data.How would you describe what is happening?

A) A hacker is trying to put a Trojan on her computer.
B) A worm has infected her computer and she needs to unplug her device.
C) It is most likely ransomware because it is telling her she has to verify payment information to unlock her computer.
D) Nothing has happened and the message is fine to ignore since she has not been home all day and her computer has not been turned on until now.