Newsela is instructional content equipment, allowing teachers to find articles along with appropriate reading levels for the students. In the given article, the word stressed implies that there is too much construction along coastlines.
Coastline is a line that differentiates the boundary between the land and the ocean or a lake.
In other words it is the outline of a coast.
As given in the article, reef ecosystems on many islands are already stressed by coastal development and pollution. The word stressed implies that there is too much construction along coastlines.
Thus, the correct option is A.
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