Congress provides by statute that any state that fails to prohibit automobile speeds of over 55 miles per hour on highways within the state shall be denied federal highway construction funding. The state of Atlantic, one of the richest and most highway-oriented states in the country, refuses to enact such a statute. The best argument that can be made in support of the constitutionality of this federal statute is that:
A. The states conceded their authority over highways to the national government when the states accepted federal grants to help finance the highways.
B. The federal government can regulate the use of state highways without limitation because the federal government paid for most of their construction costs.
C. Reasonable legislators could believe that the 55 mile-per-hour speed limit will ensure that the federal money spent on highways results in greater benefit than harm to the public.
D. A recent public opinion survey demonstrates that $90 \%$ of the people in this country support a 55 mile-perhour speed limit.
Choose A, B, C or D as your solution.
C