When Mary Sees Her Psychology Professor in the Grocery Store

When Mary sees her psychology professor in the grocery store, she does not immediately recognize her professor. Based on perceptual principles, what is the MOST likely explanation for this lack of immediate recognition?

A) Mary is more distracted in the grocery store than she is in class.
B) Mary is so busy taking notes in class that she does not pay attention to her professor's appearance.
C) Mary does not expect to see her professor in the context of the grocery store.
D) Mary is too focused on her shopping to pay attention to other people around her.