Which mode of transportation is the dominant form of domestic freight transportation?

A) Air
B) Truck
C) Rail
D) Water

Truck is the dominant form of domestic freight transportation in the United States, accounting for approximately 70% of tonnage transported. This is due to its flexibility and ability to transport goods door-to-door, as well as its lower cost compared to other modes for short to medium distance shipments. While rail and water transportation have their advantages for certain types of freight, the trucking industry remains the most widely used mode for domestic transportation.