Janie's Basketball Team Has Collected Money to Buy the Coach

Janie's basketball team has collected money to buy the coach a gift at the end of the season. Most of the girls want to get the coach a gift certificate to her favourite restaurant, but Janie and Susie want to get her tickets to the Final Four tournament that year. After a lot of discussion, Janie and Susie agree to get the gift certificate. Some of the other girls pointed out that the restaurant certificate would be better because this way the coach could take her husband and they did not have enough money to get two tournament tickets. This made Janie and Susie change their opinion about the best gift. The two girls conformed due to

A) group think
B) normative social influence
C) informational social influence
D) social facilitation