Final answer:
OBRA requires Certified Nursing Assistants to complete at least 75 hours of training, which is reflected in option A) 75 hours.
Step-by-step explanation:
The OBRA (Omnibus Budget Reconciliation Act of 1987) regulations require that Certified Nursing Assistants (CNAs) complete a minimum of 75 hours of training. Therefore, the correct answer to the question is A) 75 hours. This training is crucial as it ensures that CNAs have the essential skills and knowledge to provide quality care to residents in nursing homes and long-term care facilities.