Answer:
Either/or argument.
Explanation:
An either/or argument, also called false dilemma, is an argumentative fallacy in which the outcome of something is passed as depending on only two options when in fact there would be at least a third possible option available. In the example above, the person either joins the carpool or he won´t be able to get to work is a fallacy since, logically, that person could get to work through many other means.
