Question

read the source of the allusion.
benedict arnold was an american officer who secretly aided the british during
the american revolution.
what is the meaning of the allusion in the sentence below?
andy said he would put in a good word for julia with their boss, but she knew he had
a reputation as a benedict arnold.
an absentminded person
a traitor
an incompetent person

Explanation:

The source says Benedict Arnold secretly aided the British (enemies) during the American Revolution, meaning he betrayed his side. In the sentence, Andy said he'd help Julia but has a "Benedict Arnold" reputation, so the allusion refers to someone untrustworthy who betrays, which matches "a traitor". "An absentminded person" is about forgetfulness, and "an incompetent person" is about lack of ability—neither fit the betrayal context.

Answer:

B. a traitor