True or False: A dirty, broken, or rusty cage floor can lead to sore hocks in rabbits.

The statement about a dirty, broken, or rusty cage floor leading to sore hocks in rabbits is indeed true. Sore hocks, also known as pododermatitis, occur primarily due to prolonged pressure and irritation on the hock area of a rabbit's feet. A cage floor that is not properly maintained—whether it is dirty, broken, or has rust—can create a rough or unstable surface that increases the risk of developing these painful sores.

When rabbits are kept on an unsuitable surface, they may experience abrasions or infections from bacteria thriving in unsanitary conditions. Additionally, hard or jagged surfaces can exacerbate this condition by destroying the delicate skin on their feet. Just as crucial is the aspect of cleanliness; dirty environments can lead to infection and further complications.

The other choices provided do not address the fundamental issue that the condition of the cage floor is a critical factor in maintaining the rabbits' foot health. Active rabbits or those with long fur may have different concerns, but they do not directly correlate to the causation of sore hocks as effectively as having a properly maintained cage floor. Thus, the answer is supported by an understanding of rabbit care and the significance of a clean, well-maintained living environment.