Refer to the Newsela article "Climate Change in Hawaii and U. S. Tropical Islands." How does the word stressed affect the meaning in this sentence?

Reef ecosystems on many islands are already stressed by coastal development and pollution.

It suggests that animals on reefs are in danger from human interference.

It suggests that there are other factors affecting reefs.

It implies that there is too much construction along coastlines.

It implies that laws regulating pollution on waterways needs to be improved.