Will and Grace Have Adjoining Unfenced Back Yards and Each

Will and Grace have adjoining unfenced back yards and each has just adopted a new puppy. Will values a fence between their yards at $250 and Grace values a fence between their yards at $200. The cost of building the fence is $300, which will be split equally if they both agree to build the fence. Therefore, their payoff matrix is as follows.  
This game is a(n) ________ because ________.

A) tragedy of the commons; the backyard is treated as a common area by the puppies.
B) prisoner's dilemma; by playing their dominant strategy, both Will and Grace do worse than if they had both played their dominated strategy.
C) example of logrolling; both neighbors need to cooperate to provide the good.
D) inequitable situation; Grace does not value a fence as highly as does Will.