Which of the following statements about the evolution of cooperation among unrelated individuals is correct?     Cooperative individuals contribute more in a subpopulation. Therefore, a subpopulation that has a higher proportion of cooperative individuals will grow faster than a subpopulation that has a lower proportion.     Even for a subpopulation that grows faster due to the contribution of the cooperative individuals, selfish individuals in this subpopulation still have a higher fitness than the cooperative individuals. That is, selfish individuals are selected for in the subpopulation.     Although within each subpopulation the cooperative individuals have a lower fitness compared to the selfish individuals, the cooperative individuals still have a higher fitness when all the cooperative individuals are counted across all the subpopulations. That is, natural selection still works in favor of the cooperative individuals.     Simpsonâ s paradox is often used to explain this seemingly contradictory results of fitness advantage between within and between subpopulations.     All of the above

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Which of the following statements about the evolution of cooperation among unrelated individuals is correct?
   
Cooperative individuals contribute more in a subpopulation. Therefore, a subpopulation that has a higher proportion of cooperative individuals will grow faster than a subpopulation that has a lower proportion.
   
Even for a subpopulation that grows faster due to the contribution of the cooperative individuals, selfish individuals in this subpopulation still have a higher fitness than the cooperative individuals. That is, selfish individuals are selected for in the subpopulation.
   
Although within each subpopulation the cooperative individuals have a lower fitness compared to the selfish individuals, the cooperative individuals still have a higher fitness when all the cooperative individuals are counted across all the subpopulations. That is, natural selection still works in favor of the cooperative individuals.
   
Simpsonâ s paradox is often used to explain this seemingly contradictory results of fitness advantage between within and between subpopulations.
   
All of the above
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