Which of the Following Is TRUE About Public Goods

Which of the following is TRUE about public goods?

A) People are willing to pay for public services even though they know they will receive them without paying.
B) Left to its own device, a free market does not supply enough public goods to meet society's demands.
C) Public goods are voluntary in the sense that government cannot force people to pay for them.
D) None of the above are true.
E) All of the above are true.