Group a Listens to a Strong Speech in Favor of Stiffer

Group A listens to a strong speech in favor of stiffer penalties for drunk driving. Group B listens first to a weak speech and later to a strong speech. How much are the two groups likely to be persuaded?

A) Group A will be persuaded more strongly than Group B.
B) Both groups will be persuaded about equally.
C) Group B will be persuaded more strongly than Group A.
D) Neither group will be persuaded at all.