Final answer:
The strongest argumentative claim is that rising ocean temperatures cause the Great Barrier Reef to lose its color and die, linking climate change to ecological and economic consequences.
Step-by-step explanation:
The second sentence, "The Great Barrier Reef is losing its color and dying off because of the continuous rise of ocean temperatures," is the strongest argumentative claim. This statement provides a clear connection between ocean temperatures and the decline of the Reef. It encompasses the major threats faced by the Great Barrier Reef highlighted in the context such as climate change, coral bleaching, and the direct consequences on marine biodiversity and the Queensland economy that relies heavily on tourism.