Which of the following would most likely be considered a private benefit transaction?

Group of answer choices

a) An organization that educates the medical industry primarily serves as an advertising vehicle for the founders' medical inventions.

b) A symphony hall regularly gives free tickets to donors as a sign of gratitude.

c) A homeless shelter distributes small cash allowances directly to homeless people.

d) A prominent public charity pays a market wage to a daughter of one of the directors to work as a receptionist.