Final answer:
Discrimination against people with disabilities, as represented by the lack of wheelchair ramps for John to access his job, is a violation of the Americans with Disabilities Act, which requires reasonable accommodations for individuals with disabilities.
Step-by-step explanation:
An example of discrimination faced by people with a disability is 'B. There are no wheelchair ramps, so John is unable to get easily to his job.' This scenario illustrates a form of discrimination as it represents a lack of accommodation, which can hinder access to employment for people with physical disabilities. The Americans with Disabilities Act (ADA) was enacted to prevent such discrimination by ensuring that public spaces and workplaces are accessible, requiring features like wheelchair ramps and Braille signage.
The ADA defines a disability as a physical or mental impairment that limits major life activities. Employers must provide reasonable accommodations to facilitate an employee's work performance. If such accommodations are not present, as in the case of John, it constitutes discrimination as it limits his employment opportunities due to physical barriers.