Zero-Sum Games are a popular means of providing an interesting dilemma for the player. Unfortunately, the optimal strategy to the zero-sum game dilemma will often eventually be learned by the player. At this point, the choice becomes obvious and therefore no longer interesting. What might the game designer do to avoid the player getting bored with the game? A. Increase the time pressure related to making the decision so that optimal choices cannot easily be made B. Adapt the dilemma to instead be part of a non-zero-sum game C. Constantly introduce new rules and challenges to the game as the player gains in skill D. All of the above