Final answer:
The OBRA requirements for nursing centers state that the temperature range should be maintained between 60-70 degrees Fahrenheit.
Step-by-step explanation:
The correct answer is 1) 60-70 degrees Fahrenheit. According to the OBRA (Omnibus Budget Reconciliation Act) requirements for nursing centers, the temperature range that needs to be maintained is between 60-70 degrees Fahrenheit. This range helps to ensure the comfort and safety of the residents in the nursing center.