Select the option that can be used as a one-word substitute for the given group of words.
A seat for a passenger on a bicycle or motorbike

Correct option is D

The correct one-word for the given group of words is (d) Pillion.
A pillion is the seat or cushion behind the main rider on a motorcycle or bicycle, usually for a passenger. (Hindi meaning: पिछली सवारी की सीट)
Example: He gave her a ride sitting on the pillion of his bike.
Meanings of the given other options:
· (a) Bridle: A headgear used to control a horse (लगाम)
· (b) Cushion: A soft pillow (तकिया)
· (c) Girdle: A belt or band around the waist (कमरबंद)