Which behavior is least likely to contribute to an equine swishing its tail, nipping, and pinning its ears during a lesson?

The behavior that is least likely to contribute to an equine swishing its tail, nipping, and pinning its ears during a lesson is increased enrichment in class. Enrichment can include activities that stimulate a horse's mind and body, such as varied exercises or engaging tasks that keep the horse interested and occupied. When a horse is mentally stimulated and engaged, it may be less likely to show negative behaviors associated with stress or discomfort.

In contrast, an unbalanced rider or incorrect handling by the leader can create discomfort or anxiety for the horse, leading to the behaviors mentioned. An unbalanced rider may inadvertently cause the horse to feel insecure or off-balance, resulting in agitation. Similarly, incorrect handling by the leader can lead to confusion or fear in the horse, prompting it to express itself through swishing its tail, pinning its ears, or nipping. Additionally, having too many people in the space can increase the horse's stress level due to overcrowding and a lack of personal space, which can also lead to the negative behaviors noted. Thus, increased enrichment in class fosters a more positive environment for the horse, making it less likely to display such behaviors.