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 their life.What benefits do organisms derive from keeping a territory?

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