Scientists have monitored a population of black bears in a temperate forest. The current population size is 400, and the forest's carrying capacity for black bears is 640. The scientists estimate the bears' population growth rate, in individuals per year, through the model below. In the model, N represents the population size in each year. The scientists predict that the bears' population will increase to 640 within the next five years. According to the model, what will happen to the population's growth rate during this time? A. It will increase as the population increases to 640 individuals, and then rapidly decrease. B. It will decrease to 0 as the population reaches its carrying capacity. C. It will remain constant until the population reaches 640 individuals, and then begin increasing. D. It will become negative as the population approaches its carrying capacity.