The Great Barrier Reef, __________ world’s largest coral reef system, is located in __________ Coral Sea. A. no article / the        B. the / the                  C. the / no article         D. no arti...

The correct answer is B. "the / the" The Great Barrier Reef, the world’s largest coral reef system, is located in the Coral Sea. In this case, "the" is used before "Great Barrier Reef" because it is a specific and unique entity. Additionally, "the" is used before "Coral Sea" because it refers to a specific body of water.