Some Animals Define a Territory and Defend It

Some animals define a territory and defend it.Maintaining a territory costs in terms of the energy expended in defense and puts the defender and the aggressor at risk of an injury that could cost them their lives.What are the main benefits that organisms derive from keeping a territory?

A) Obtaining a mate and keeping a constant supply of food
B) Obtaining a mate and defeating predators
C) Keeping a constant supply of food and encouraging other species to settle in the area
D) Encouraging other species to settle in the area and obtaining a mate
E) Defeating predators and encouraging other species to settle in the area