The property being illustrated in the graph is carrying capacity. Option C is correct.
Carrying capacity refers to the maximum population size that an environment can sustain indefinitely, given the available resources.
In the graph, we see that the population of Species D grows rapidly at first, following an exponential curve. This initial rapid growth is characteristic of populations with abundant resources and few limitations.
We see that as the population size approaches a certain point, the growth rate starts to slow down and eventually levels off. This plateauing off, despite the seemingly unlimited resources, indicates that the environment has reached its carrying capacity for Species D. Beyond the carrying capacity, the population would start to decline due to resource depletion or increased competition.