Categorical Grants-In-Aid That Funded a 900,000-Mile National Highway System Indirectly

Categorical grants-in-aid that funded a 900,000-mile national highway system indirectly promoted business because the project

A) pulled more workers from the private sector into government jobs.
B) also funded a worker training program.
C) facilitated the use of motor transportation to improve national markets.
D) required the import of massive amounts of oil from the Middle East.
E) required the import of massive amounts of gravel from Mexico.