Just as the 'king' is related to the 'throne', in the same way the 'rider' is related to whom?

Given: 'king' is related to the 'throne'

Option (a): Seat/Pedestal –  A rider sits on a seat/pedestal while riding. (True)

Option (b):  Horse – A horse is what the rider rides, not what they are seated on.

Option (c): Chair – A chair is not specific to a rider.

Option (d): Stick – A stick is unrelated to a rider's position.

So, rider is related to seat/pedestal.

Thus, correct option is (a).