Which of the following is a correct statement about the federal government's role in
interstate commerce?
a. The federal government has no role in regulating interstate commerce.
b. The federal government's role is limited to regulating commerce transported on
interstate waterways such as the Mississippi River.
c. The federal government's role is limited to regulating the transport of agricultural
goods.
d. The federal government's role has been greatly expanded through the
interpretation of the interstate commerce clause.