Which of the following contributes to the health of a rabbit?

Providing proper sanitation is essential for the health of a rabbit. Clean living conditions prevent the buildup of harmful bacteria and pathogens that can lead to illness. Maintaining a clean environment reduces stress for the rabbit and promotes a healthier lifestyle. This includes regular cleaning of the rabbit's habitat, ensuring fresh water is available, and properly disposing of waste.

Feeding a rabbit solely hay, while hay is an important part of their diet, lacks the necessary variety of nutrients they need for optimal health. Similarly, keeping rabbits in small cages can lead to stress and limited movement, which is detrimental to their physical and mental well-being. Using scented bedding might introduce harmful chemicals or irritants that could adversely affect a rabbit's health. Thus, sanitation emerges as the key factor in ensuring a rabbit's health and wellness.