Which of the Following Best Explains Why It Is Sometimes

Which of the following best explains why it is sometimes efficient to charge a positive price for the use of some products such as museums,beaches,and roads?

A) Each person consuming the product has a positive marginal benefit and should therefore pay a positive price.
B) Since these products are non- excludable,it is sometimes efficient to charge a positive price.
C) Once these products become congested they become rivalrous,marginal cost is positive,and a positive price is then efficient.
D) Since these products are excludable and non- rivalrous,it is always efficient to charge a positive price.
E) Since these products are excludable,marginal cost is always positive,and a positive price is appropriate.