单选题:WhatdoestheexampleofIndiaillustrate?

题目内容:
WhatdoestheexampleofIndiaillustrate? A.Wealthypeople.tendtohavefewerchildrenthanpoorpeople.
B.Naturalselectionhardlyworksamongtherichandthepoor.
C.Themiddleclasspopulationis80%smallerthanthatofthetribes.
D.Indiaisoneofthecountrieswithaveryhighbirthrate.

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