All of the following would result in a change in population size except
a. immigration of individuals into the population range.
b. emigration of individuals out of the population range.
c. equal birth and death rates.
d. the death rate exceeding the birth rate.

The correct answer is C. equal birth and death rates. If they were equal, that would mean that there would be an equilibrium in population and that it would not increase or decrease. That is if the immigration and emigration rates remain the same however, but they would be the same in this situation since it's an ideal situation used for a question.