Which if the following is the best example of a public good?

If there is a national debt, we can conclude that the federal government has

A) borrowed in the past. B) purchased more goods and services than were needed. C) spent money foolishly. D) loaned funds to U.S. taxpayers in the past. E) loaned funds to other nations in the past.

In the above figure, what is the marginal social cost to the economy of producing the four-hundredth pretzel?

A) $0 B) $2.00 C) $4.00 D) None of the above answers are correct.