How can you gauge a horse's overall wellbeing during conditioning?

The correct choice highlights the importance of a comprehensive approach to evaluating a horse's overall wellbeing during conditioning. Observing behaviors such as appetite, disposition, and recovery times provides valuable insights into how a horse is coping with its exercise regimen.

Appetite can indicate whether a horse is feeling healthy and energetic; a reluctance to eat might suggest stress or physical discomfort. Disposition reveals a horse's mental state and can hint at physical issues—an irritable or uncooperative horse may not be enjoying its conditioning or could be in pain. Recovery times after exercise are crucial as they indicate fitness levels; a horse that recovers quickly is generally in better shape than one that takes longer.

While assessing heart rate, weight, and factors like age and breed can contribute to understanding a horse's condition, they do not provide as comprehensive a picture as behavioral observations. Behavioral indicators reflect not only physical health but also emotional wellbeing, making option B the most encompassing choice for gauging a horse's overall wellbeing during conditioning.