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The only one i can see caused primarily by human activities would be A. Air Pollution.
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Answer:
Explanation:
The most important motive for early European exploration across the Atlantic was the dream of enormous riches. Initially, explorers and merchants hoped to find a sea route across the Atlantic to the thriving markets of Asia. But Columbus and his fellow Europeans greatly miscalculated the circumference of the earth.
The Great Barrier Reef is one of the famous wonders of the world that is situated near the East Coast of the Australian continent. In addition to that, the region is most likely known to have a huge presence of coral reefs. Actually, there are many islands east of the reef and one of which is the country of Fiji.
