Unlike a private good,a public good:

A) has no opportunity costs.
B) has benefits available to all,including nonpayers.
C) produces no positive or negative externalities.
D) is characterized by rivalry and excludability.

Public goods are characterized by two main features: non-excludability, meaning that it is difficult or impossible to prevent someone from using the good, and non-rivalrous consumption, meaning that one person's consumption of the good does not reduce its availability to others. Because of these features, public goods provide benefits to everyone, including non-payers. The other answer choices do not accurately describe public goods.