What is the one-word substitute for “bike seat other than rider”?

This question tests your knowledge of specific vocabulary, particularly one-word substitutes for common phrases.

• D. Pillion is the correct one-word substitute. A pillion is specifically a seat for a passenger behind the rider on a motorcycle or bicycle.
• A. Saddle refers to the main seat for the rider on a bike or horse.
• B. Cushion is a general term for a soft pad, not specific to a bike passenger seat.
• C. Bridle is a piece of headgear used to control a horse, completely unrelated to bikes.