Jerry Was Recently Contacted by a Coworker Who Received an Email

Multiple Choice

Jerry was recently contacted by a coworker who received an email that seemed suspicious. Jerry investigated her email account and noticed that she had been sending hundreds of emails every day for a week. He also noticed that this problem started after the coworker sent a reply email agreeing to participate in a contest to win a free car wash. ​
What happened to the coworker's email account?

A) Her email was spoofed.
B) Her email was hijacked.
C) She has been added to a botnet.
D) She turned off the spam filer.