Answer: B. prey.
Explanation:
A predator is an organism which feeds upon other organism by killing it. It is typically a carnivorous organism which kills other organism to obtain it's flesh to obtain it as food.
A prey is an organism which is killed by the predator. It is usually inferior than the predator.
In the given situation, wolf is the predator which kills and feeds the moose. Hence, in this interaction, the moose is a prey.
