Read the following diary entry, then answer the question that follows:

dear diary,
i can't believe it! yesterday, we finished choreographing the perfect routine for the talent contest. today, i find out that becky has shared all of our moves with the team we were competing against. that benedict arnold even gave them a copy of our customized music mix.

this diary entry alludes to a benedict arnold. this historical allusion indicates that the writer of the diary thinks becky is a

cheater
friend
contact
traitor