The correct answer is C. Currently, it is illegal to go whaling (or whale fishing) yet, some countries have not done so. Extreme fishing of any sort can lead to extinction, therefore, it's C, Furthermore, A is incorrect as nothing in the text points to that, B is incorrect as there is plenty of oil, and none of it comes from whales. D is incorrect as many people hunt whales for fun, or for occasional food, never as a meal they can live on, plus, if you live near the water, you could always fish for fish. Hope this helped.