Which of the following is a permanent disqualification for rabbits?

The absence of color in a rabbit is indeed a permanent disqualification according to breed standards and show regulations. Each rabbit breed has specific color requirements that are critical for judging. If a rabbit does not exhibit the appropriate color for its breed, it fundamentally fails to meet the criteria for that breed's standard, resulting in disqualification from the show. The emphasis here is on adherence to established breed characteristics, which are crucial for maintaining breed integrity and aesthetic expectations in the show ring.

On the other hand, conditions like open wounds or illness may be temporary and can sometimes be treated before a show. While they are serious concerns for the health and well-being of the rabbit, they do not have the same direct impact on breed standard compliance as the absence of color. Similarly, a broken toenail is an injury that can heal or be managed, and although it may detract from the presentation of the rabbit, it does not constitute a disqualification in the same way a lack of required color does.