The WaveHouse on Mission Beach in San Diego Features the Bruticus

The WaveHouse on Mission Beach in San Diego features the Bruticus Maximus, a ten foot wave, which tests the skills of even the most talented surf and wake board riders on the planet. WaveHouse is the only place in San Diego where this service is offered. If you are a member of WaveHouse, you can ride for half the price that a non-member pays. This is an example of

A) price discrimination among groups of buyers.
B) price discrimination among units of a good.
C) rent seeking behavior.
D) monopoly regulation.