The Americans with Disabilities Act prohibits employers from discriminating against people with which of the following conditions?

The correct choice, epilepsy, is a recognized condition that the Americans with Disabilities Act (ADA) seeks to protect individuals against discrimination. The ADA outlines that a disability is a physical or mental impairment that substantially limits one or more major life activities. Epilepsy is classified as a neurological condition that affects brain function, often resulting in seizures, which can significantly interfere with a person's ability to perform daily activities.

In contrast, while diabetes and asthma can also impact a person’s life, the ADA does not universally classify these as disabilities unless they severely limit major life activities. The determination often depends on the individual case and how the condition affects that person, leaving some uncertainty around these conditions. Obesity, while considered a health issue, generally does not qualify under the ADA unless it can be linked to an underlying physiological condition that severely limits life activities.

Therefore, epilepsy is clearly recognized under the ADA as a condition that warrants protections against discrimination, making it the most straightforward answer in this scenario.