Which of the following is not a basic part of the bridle?

The correct answer is identified as "D" because stirrups are not a component of the bridle. The bridle is an essential piece of tack used to guide and control a horse, and its fundamental parts include the headstall, which supports the bit and reins, and the bit itself, which goes into the horse's mouth to aid in communication between the rider and the horse. Reins, attached to the bit, allow the rider to pull or direct the horse effectively.

Stirrups, on the other hand, are part of the saddle, which is distinct from the bridle. They serve as a foot support for the rider while mounted on the horse and do not play a role in the horse's headgear or control mechanisms associated with the bridle. Understanding the components of both the bridle and saddle is crucial for effective horse handling and riding techniques.