Based on these observations, which ecosystem is likely the most sustainable over time? A. Ecosystem 1, because it has the fewest

Based on these observations, which ecosystem is likely the most sustainable over time?
A. Ecosystem 1, because it has the fewest species.
B. Ecosystem 2, because it includes both fish and birds.
C. Ecosystem 3, because it has the greatest amount of insects.
D. Ecosystem 4, because it supports the greatest amount of organisms.