A non-excludable good is a type of product or service that is challenging or impossible to exclude individuals from using, even if they haven't paid for the non-excludable goods are:
b. Grand Canyon
d. Library
e. Story writing option b, d, e
The Grand Canyon is an example because it's a natural place that anyone can visit.
A library is another example because it's open for everyone to use.
Creating stories with Marvel characters could also be one since it's about making up stories, not a specific Marvel product.
On the other hand, things like sewer services, billboards, mail delivery, and the internet are usually easier to limit or control who gets to use them in some way. For instance, you might need to pay for internet access or postage for mail delivery.
The question
Which of the following is considered non-excludable?
a. Sewer services in a city
b. Grand Canyon c. Billboards
d. Library
e. Story writing with Marvel characters.
f. Mail delivery g. Internet