The picture below shows a mangrove ecosystem. In this ecosystem, pelicans nest in mangrove trees. Crabs consume mangrove leaf litter. Snails consume algae on mangrove roots.

How would a decrease in mangrove trees in this ecosystem affect the other living things there?

A. Snail, crab, and pelican populations would decrease.

B. Snail and crab populations would decrease while pelican populations would increase.

C. Pelican populations would decrease while snail and crab populations would increase.

D. Snail, crab, and pelican populations would increase.