Why Do We Expect That Territory Size Will Often Be

Why do we expect that territory size will often be negatively correlated with the number of competitors in the environment?

A) As competitors increase, stabilizing selection increases.
B) As competitors increase, individuals require more food.
C) As competitors increase, disease transmission rates increase.
D) As competitors increase, density-dependent selection increases.
E) As competitors increase, so does the cost of territory defense.