Concept:A population that exceeds its carrying capacity and then collapses shows a rise-and-fall pattern over time.
Explanation:When a population goes beyond the carrying capacity of its environment, available resources become insufficient for all individuals.
As a result, the population first rises sharply to a peak, then declines rapidly due to increased death rate.
On a graph of population size against time, this pattern resembles a single rise followed by a fall.
This is best represented by a bell-shaped curve, not by a linear, sigmoid, or skewed curve.
Answer:A. bell-shaped curve