Which of the following is a situation in which a density-independent factor influences the size of a population?
A. The effect of disease that spreads throughout a forest of pine trees.
B. The effect of pesticides running off of a field into a waterway on populations of aquatic insects.
C. The effect of intense infestation of deer ticks on a population of white-tailed deer.
D. The effect of overgrazing by cattle on a prairie.
