What relationship exists between rail and inland water transport？A．Labor restrictions prev

What relationship exists between rail and inland water transport？

A．Labor restrictions prevent the two from handling the same traffic and have prevented competition from developing.

B．Railroads carry different commodities and thus are not in direct competition with water transport.

C．They sometimes compete with one another.

D．Railroads are never routed along the same routes as water transport, so the two do not compete.