Which Statement About Density-Dependent or Density-Independent Growth Is True

Which statement about density-dependent or density-independent growth is true?

A) A decrease in birth rate with increasing population size is a density-independent factor.
B) An increase in emigration rate with increasing population size is a density-dependent factor.
C) Only density-independent factors can regulate population size.
D) Density-independent factors do not have large effects on population size.