Bonnie, Who Has a Peanut Allergy, Peruses the Refreshment Table

Bonnie, who has a peanut allergy, peruses the refreshment table a bridal shower. She sees a plate stacked with sandwich triangles: some made with peanut butter, and some with pimento cheese. Which statement is true?

A) It is safe for Bonnie to try a peanut butter triangle if she only eats half of it
B) It is not safe for Bonnie to eat a sandwich because of potential cross-contamination
C) It is safe for Bonnie to try a sandwich triangle as long as she chooses pimento
D) It is not safe for Bonnie to eat a sandwich because you can't tell from the pimento cheese label whether it contains peanuts