What part of the passage best states hardin's central argument?
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a. for example, a nation's land has a limited capacity to support a
population and as the current energy crisis has shown us, in some
ways we have already exceeded the carrying capacity of our land.
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b. first, we must recognize the limited capacity of any lifeboat.
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c. if we divide the world crudely into rich nations and poor nations,
two thirds of them are desperately poor, and only one third
comparatively rich, with the united states the wealthiest of all.
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d. metaphorically each rich nation can be seen as a lifeboat full of
comparatively rich people. in the ocean outside each lifeboat
swim the poor of the world, who would like to get in, or at least to
share some of the wealth,
subaws