Moral hazard in a transaction hurts

According to Okun's law

A. an increase in inflation above trend, will lower unemployment B. an increase in real gdp growth above trend, will lower unemployment C. an increase in interest rates, above trend, will lower unemployment D. an increase in real gdp growth, above trend, will lower inflation

For a natural monopoly, long-run average costs

A) fall as output increases. B) rise as output increases. C) fall as output falls. D) rise as output falls.