Final answer:
If Timothy chooses to attend a vocational school, the career field that would not be available to him is Law.
Step-by-step explanation:
If Timothy chooses to attend a vocational school to learn a trade, the career field that would not be available to him is Law (option C).
Vocational schools focus on providing hands-on training and specialized skills for specific careers. Plumbing (option A), Truck driving (option B), and Nursing (option D) are all fields that can be pursued through vocational education.
It's important to note that Law typically requires a four-year bachelor's degree followed by law school, and vocational schools do not typically offer the necessary education for becoming a lawyer.