Creating a law to restrict the personal use of cars and requiring everyone to use public transportation would be as unthinkable as revising the laws of gravity. There are some forces so fundamental that we have no control over them.

What makes this analogy unsound?
A. Societies do have control over the laws they make.
B. Controlling personal car use takes minimal effort.
C. Rules and laws always have some exceptions.

C. Rules and laws always have some exceptions. This statement contradicts the analogy because it suggests that it is possible to revise or change laws, even if there may be exceptions or variations in their application. The analogy implies that some forces, like the laws of gravity, are unchangeable and beyond human control.

The correct answer is B. Controlling personal car use takes minimal effort.

The analogy implies that creating a law to restrict personal car use and promote public transportation is as unthinkable as revising the laws of gravity. However, this analogy is unsound because it suggests that controlling personal car use takes minimal effort, which is not accurate. Implementing such a law would require significant planning, infrastructure development, public support, and potentially significant financial investments. Therefore, option B identifies the flaw in the analogy.