Marine biologist: Scientists have long wondered why the fish that live around coral reefs exhibit such brilliant colors. One suggestion is that coral reefs are colorful and, ttherefore, that colorful fish are camouflaged by them. Many animal species, after all, use camouflage to avoid predators. However, as regards the populations around reefs, this suggestion is mistaken. A reef stripped of its fish is quite monochromatic. Most corals, it turns out, are relatively dull browns and greens. Which one of the following most accurately expresses the main conclusion drawn in the marine biologist's argument? ['The fact that many species use camouflage to avoid predators is one reason to believe that brightly colored fish living near reefs do too.', 'It turns out that the corals in a coral reef are mostly dull hues of brown and green.', 'A reef stripped of its fish is relatively monochromatic.', 'The suggestion that the fish living around coral reefs exhibit bright colors because they are camouflaged by the reefs is mistaken.']