Which of the following would not be an example of density-dependent factors regulating population size?

A) The number of possible territories for robins is limited; thus when population sizes are high, a lower proportion of individuals can produce offspring.
B) In conditions of overcrowding, some desert pupfish living in ponds will emigrate to other ponds if given the opportunity.
C) Predation on mosquitofish is high, regardless of population size.
D) In conditions of high density, mice are more susceptible to mortality from heat stress.