A condition is Pareto optimal when A. no change is possible that will make some members of society better off without making some members of society worse off. B. some change is possible that will make most members of society better off without making some members of society worse off. C. some change is possible that will make some members of society better off without making some members of society worse off. D. no change is possible that will make most members of society better off without making some members of society worse off. E. None of the above.