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C. HUNTING WOLVES.

Wolves prey on deer, which results to the diminishing of the deer population. When humans hunt wolves, they are diminishing the number of wolves, which in turn, enable the deer population to grow their numbers.

Hunting bisons does not affect the deer population because bisons are grazers, they do not prey on deer or any other animals.

Clearing land for farming and city building will contribute in the decrease of deer population due to the loss of their natural habitat.