The Department of Transportation controls commercial transportation including which modes?

• A. Air only
• B. Space only
• C. Surface, Sea, and Air
• D. Land and Space

Answer: (C)

The Department of Transportation regulates the major commercial transportation modes: surface, sea, and air. This broad oversight comes from its work across agencies that cover highways and rail (surface), ships and ports (sea), and airplanes (air). Space isn’t treated as a standard transportation mode under DOT in the same way, since space activities are handled by other federal entities. So, the option that includes surface, sea, and air correctly reflects what DOT oversees. Limiting it to air misses the other two, focusing only on space omits land and air, and listing land and space leaves out aviation and maritime oversight.