Which of the Following Is the Best Example of Normative

Which of the following is the best example of normative influence?

A) Daniel studies for 5 hours a night because his professor told him that studying was the best way to pass her class.
B) Although Neil broke his leg and can't play, he still wears his team colors on game day.
C) Greg gives a standing ovation at the concert, but he personally thinks that the band was sub-par.
D) All of the above