Answer: legal
Step-by-step explanation:
The Environmental Protection Agency (EPA) was established in so that both human and the environmental health can be protected.
Based on the information given in the question, the companies that replace inefficient sources of power with quantum nucleonics only after they are required to by the Environmental Protection Agency are operating at a legal responsibility level. It should be noted that the law will have to be obeyed by the business at this legal responsibility level.