Which of the following conditions could lead to disqualification in rabbit judging?

Severe digestive problems in rabbits can lead to disqualification in the context of rabbit judging because health issues that significantly affect a rabbit’s wellbeing and performance are critical in determining their suitability for competition. During judging, the overall health and condition of the rabbit are essential criteria, as judges are looking for healthy animals that can perform well according to the breed standards. Severe digestive issues not only indicate poor health but may also impact the rabbit's appearance and temperament.

In contrast, minor grooming issues might be overlooked as they do not reflect the rabbit's overall health or breed quality. Unharmonious color patterns could be a fault in terms of breed standards, but they do not necessarily imply a health concern, nor do they typically result in disqualification unless they deviate significantly from breed specifications. Proper age classification is expected from all competitors and would not typically be a reason for disqualification. Thus, severe digestive problems represent a more serious health concern that justifies disqualification in a competitive setting.