It is common to talk about options, where an option is a course of action an agent can take. A course of action, in turn, is that which can be the object of intention. It has not often been noticed in the literature, though, that there are two ways to understand what makes something an option: first, an option just is some course of action physically open (or, to be maximally liberal, logically open) to an agent; second, an option just is some course of action that the agent either in fact deliberates about taking or is psychologically capable of deliberating about taking. At any given time, there are far more courses of action open to an agent than the agent can or does deliberate about taking. What determines which courses of action an...