The Price Charged for Access to an Uncongested,excludable,non-Rivalrous Good Should

The price charged for access to an uncongested,excludable,non-rivalrous good should be ________ because ________.

A) positive; consumers receive a positive marginal benefit from consuming the good
B) positive; marginal cost and marginal benefit for this good are both positive
C) positive; more than one person can consume this good at the same time
D) zero; it is inefficient to exclude people from consuming this good once it has been supplied
E) zero; the marginal benefit of the last unit consumed is zero