Answer:
The correct option would be A. It drops quickly to zero once the temperature goes below freezing.
Carrying capacity is defined as the number of organisms (animals, plants, crops, or birds) a region can support without getting degraded.
The temperature in the northern New York forest can drop below freezing during winters. Due to this, insects either migrate the place or spend winters as eggs, larvae, nymphs, or pupae.
It resulted in the unavailability of insects or food for insectivorous birds due to which carrying capacity of a region quickly drops to zero.
