What did the 1989 amendments require for the care of non-human primates?

• A. They must have an adequate environment for psychological well-being.
• B. Lights must be kept on at least 14 hours per day for maintaining physiological cycles.
• C. They must be given 2 fruits per day for nutritional and environmental enrichment.
• D. They must have regular one-to-one interaction with humans for social adjustment.

Answer: (A)

The key idea is that care for non-human primates must support their psychological well-being through an enriched environment. The 1989 amendments to the Animal Welfare Act expanded protections to primates and require that their housing and husbandry provide opportunities for species-typical behaviors, social interaction when appropriate, and environmental enrichment that promotes mental well-being. This focuses on giving Primates more than basic shelter: items to manipulate, social housing when feasible, foraging and enrichment opportunities, and a setup that reduces stress and abnormal behaviors.

That’s why the option describing an adequate environment for psychological well-being is the best match. The other ideas—the specific lighting schedule, a fixed amount of fruit, or mandatory one-to-one human interaction—aren’t what the amendments prescribe. The emphasis is on enrichment and an environment that supports mental health, not on a single prescribed routine.