Use the following graph to answer the next question. What is the profit maximizing quantity of output for this pure monopoly?

The income per capita of a country with a population of 50,000 is $4,500. Its gross domestic product is ________

A) $54,500 B) $900,000 C) $225,000,000 D) $120,000,000

In the above figure, if the natural monopoly is regulated using a marginal cost pricing rule, then the firm will

A) produce 8 million units and make an economic profit of $24 million. B) produce 12 million units and make zero economic profit. C) produce 16 million units and incur an economic loss of $64 million. D) produce 16 million units and make zero economic profit.