Answer
b
Work Step by Step
*Private goods are rival in consumption because the use of the good by one individual decreases the chances for other individual to use it. Say pizza sales, if a person buys all pizzas available, next client in line won't be able to purchase pizza.
*Common resources are also rival because resources are scarce and finite, if one fisherman fishes all the fish in a lake the next fisherman won't be able to fish at all.
