If a baby pulls their legs in toward their chest, it is a sign of abdominal or stomach pain. Something to do with the stomach.
A. A fact that elaborates on the point of the writing.
Answer:
D. Interregional migration best describes a move from the suburbs to a nearby city.
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I believe an answer could be assimilation, as assimilation is the integration or process of people/ideas/culture into a bigger culture or society. It was one of the major results of immigration into the United States.
I hope this helps :)