Meredith is waiting in a room with several other people. She notices that smoke is coming from a vent on the floor. She looks to the others in the group and sees that they are not concerned, so she decides they must know something she doesn't and there is no cause for alarm. Which of these best describes Meredith's behavior?
A) Pluralistic ignorance
B) Diffusion of responsibility
C) Groupthink
D) The bystander effect