When a good is rival in consumption,

a. one person's use of the good diminishes another person's ability to use it.

b. people can be prevented from using the good.

c. an unlimited number of people can use the good at the same time.

d. everyone will be excluded from obtaining the good?

When a good is rival in consumption, one person's use of the good diminishes another person's ability to use it.

A rival good is a good that can only be purchased or consumed by a single user. When they use this good or purchase it, they take the ability of someone else to use it away. This item can be durable or not durable but consumption destroys it.