Final answer:
A natural disaster is not a density-dependent limiting factor because it affects populations regardless of their density, unlike predation, competition, and disease which are all density-dependent.
Step-by-step explanation:
The option that is NOT an example of a density-dependent limiting factor is A. natural disaster. Density-dependent factors are those that have a greater impact on a population as its density increases. These include predation, competition, accumulation of waste, and disease. Natural disasters, such as forest fires or floods, are considered density-independent factors because they affect populations regardless of their density. Thus, a natural disaster does not become worse as the population density increases.