A specific species of fish has recently experienced an increase in its carrying capacity. What could explain this increase in carrying capacity?

A. The species lives on a coral reef that has experienced an increase in photosynthetic algae.
B. The species lives on the ocean floor, and one of its competitors for food has experienced an increased population.
C. The species lives mutually with another species that has recently experienced a decline in its population due to parasites.
D. The species lives in an estuary that has recently experienced a large influx of fresh water due to flooding of the nearby rivers.