According to the sentences, the trait that is shared by all public goods include option C: The ability to exclude people.
Public goods are refers to as the goods that are provided by the government for the general public of the country.
The public goods are non exclude-able because no one can be excluded from using these goods and the use of these goods by one cannot reduce the availability of it for the others.
Therefore, correct option is C.
Learn more about a free-rider problem, refer to the link:
https://brainly.com/question/6968258