I don't know your answer choices but I hope this is one of them, the correct answer is B. Tennis Game. Hope its correct and one of your choices let me know.
Answer:
<u><em>Once a species starts dwindling in numbers, there's a smaller pool of available mates and often a corresponding lack of genetic diversity. This is the reason it's much healthier to marry a complete stranger than your first cousin, since, otherwise, you run the risk of "inbreeding" undesirable genetic traits, like susceptibility to fatal diseases.</em></u>
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