Economists Consider a Pure Public Good to Be Nonexcludable If

Economists consider a pure public good to be nonexcludable if:

A) it is difficult but not impossible to keep it from consumers who do not pay for it.
B) it is difficult or impossible to keep it from consumers who do not pay for it.
C) it is difficult but not impossible for one person to consume a unit of it apart from other units.
D) one person cannot consume a unit of it apart from other units.
E) one person cannot keep it from consumers who do not pay for it.