The correct answer is D. Change have hunted to hunt
Step-by-step explanation:
The text presented describes the features of "Island of the Sharks" or Cocos which is located in the Pacific Ocean, this includes the existence of Jewe-like fish that are eaten by the hundreds of sharks and that is included in sentence (4) Jewel-like fish circle the island's underwater reef, while hundreds of sharks have hunted them in packs. However, this sentence should be corrected as the use of "have hunted" is incorrect considering sharks hunt this type of fish all the time, also all the text is in present simple and therefore the verb "have hunted" should be changed to "hunt" as "Jewel-like fish circle the island's underwater reef, while hundreds of sharks hunt them in packs".