Final answer:
Hanging mirrors are not typically used for environmental enrichment with rabbits because they can cause stress due to rabbits' inability to recognize their own reflections, potentially leading to territorial behavior.
Step-by-step explanation:
The item that would not likely be used for environmental enrichment with rabbits is C) Hanging mirrors. Rabbits are prey animals, and sudden movements or unexpected images could cause stress rather than enrichment. The typical enrichments include tunnel systems, which mimic natural burrowing behaviors; gnawing blocks, which help keep their teeth in good condition; and scented bedding, which provides comfort and can engage their sense of smell. Mirrors might confuse or startle rabbits, as they do not recognize their own reflections and could perceive another rabbit in their space, potentially causing territorial stress.