At First, Group a Listens to a Weak Attack on a Common

Multiple Choice

At first, group A listens to a weak attack on a common belief, while group B listens to a speech supporting that belief and group C listens to music. Then all three groups listen to a strong attack on that belief. Which group (if any) will be influenced least by the strong attack?

A) Group A will be influenced least.
B) Group B will be influenced least.
C) Group C will be influenced least.
D) All three groups will be influenced equally.