Which form of transport provide door to door service ?

The correct answer is option 1: Land transport

Option 1: Land transport. This statement is correct because road transport, a part of land transport, provides door-to-door service directly from the source to the destination.

Option 2: Air transport.  Air transport is fast but does not provide direct door-to-door service because airports are required at both ends.

Option 3: Water transport.  Water transport depends on ports and waterways and therefore cannot provide door-to-door service.