human activities that directly threaten coral reefs include ______.
a. increased land runoff of sediments, as a result of development and deforestation
b. trampling by careless sport divers
c. the release of human and animal waste into coastal waters
d. dragging boat anchors
its beacause a. is the only reasonable answer cause if it was d. it would just it something else meanwhile with c it a sea creature poison and b is gonna be anything else and pls brainliest me if im right
