Mayor: There has been a long debate in city council about how to accommodate projected increases in automobile traffic. Today, our choice is clear: either we adopt my plan to build a new expressway, or we do nothing. Doing nothing is not a viable option because our existing system of roads would be in gridlock within ten years given even a conservative estimate of future traffic levels. City council should ttherefore adopt my plan.
The reasoning in the mayor's argument is most vulnerable to the criticism that it presents a choice that is limited to two options, without giving reasons for not considering any other options.