Which of the Following Situations Illustrates a Link Between the Effects

Which of the following situations illustrates a link between the effects of density-dependent and density-independent factors?

A) A flood causes a river to overflow and drown a herd of deer.
B) A drought occurs; a small herd of deer survives, whereas a larger herd in the same area perishes.
C) A population of deer increases to a size at which individuals are competing with each other to get enough food.
D) Density-dependent and density-independent factors cannot affect the same population of organisms at the same time.