Final answer:
A company needs to have at least 15 employees to comply with the Americans with Disabilities Act (ADA) of 1990. Option B is correct.
Step-by-step explanation:
To comply with the Americans with Disabilities Act (ADA) of 1990, a company must have at least 15 employees. According to the ADA, employers with more than fifteen people are required to make reasonable accommodations for disabled persons, ensuring that individuals with disabilities have equal opportunities in employment. This act is a significant piece of civil rights legislation aimed at reducing discrimination and promoting accessibility for individuals with disabilities in both public and private sectors.