In Which of the Following Situations Will a Director Have

In which of the following situations will a director have breached their duty to exercise their powers for a proper purpose?

A) The director has put themselves in a situation where their duties to the company and their personal duties conflict.
B) The director has agreed to vote in a certain way at future board meetings.
C) The director has done something which no reasonable director could regard as being in the interests of the company.
D) The director has exercised one of their powers primarily in order to gain some private advantage.