Some Animals Define a Territory and Defend It

Some animals define a territory and defend it. Maintaining a territory is costly in terms of the energy expended in defense and the risk of injury or death. Which of the following is a benefit of maintaining a territory?

A) eliminating predators
B) encouraging other members of the population to settle in the area
C) eliminating predators and encouraging other members of the population to settle in the area
D) obtaining a mate and keeping a constant supply of food
E) obtaining a mate and encouraging other species to settle in the area