(Car : Road) , (Ship : Sea) , (Rocket : Space) , (Aeroplane : Pilot)
Option:
Justification: In all other pairs, first is the means of transport on the medium denoted by the second.

(Car : Road) , (Ship : Sea) , (Rocket : Space) , (Aeroplane : Pilot)
Justification: In all other pairs, first is the means of transport on the medium denoted by the second.