Excludability is the property of a good whereby

A. a person can be prevented from using it.

B. the resource is congestible.

C. the government rations the quantity of a good that is available.

D. one person's use diminishes other peoples' use.

A. a person can be prevented from using it.

Explanation:

Excludability -

In economics, a good or service is refereed to as excludable, when it is not allowed to be consumed or used by the consumers who have not paid for the good or services.

And, similarly, non - excludable are the one when a non - paying consumer ca not be prevented from using it.

Hence, the correct statement for Excludability is (a).