A Nonrival Good Is a Good

A nonrival good is a good:

A) that someone cannot be easily excluded from using.
B) where the market has only one producer, so the producer does not face any rival suppliers.
C) where one person's use of the good does not reduce another person's ability to use the same unit of the good.
D) in which only one version is available, so consumers do not have choices, although there are many sellers.