In which of the following situations would a union have breached its duty of fair representation?

Select one:

A$.$ A team suspends a player for being present during a demonstration that escalated into a riot even though the player himself did not break a law; the union agrees with the suspension and does not support the player's request for arbitration.

B$.$ As part of its collective bargaining agreement goals, the union negotiates to raise the league's salary cap.

C$.$ A player tests positive for the second time during a random drug test because a trainer, without the player's knowledge, has been providing supplements that are banned; the union steps in to negotiate more moderate penalties to be assessed against the player.

D$.$ A player with unrestricted free agency decides to stay with the current team offering a lower salary; the team offering the higher salary wants the player disciplined for negotiating in bad faith; the union refuses to do so$.$