A language family is:
A. traces through extensive and accurate written documents
B. a collection of languages that share a common but distant ancestor
C. a region where an innovation, idea, belief, or cultural practice begins
D. a group of languages that are related by physical geography

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How would i answer this for an exam?

Ascientist is explaining how background cosmic radiation gives evidence of the big bang theory. she says that radiation has been detected everywhere equally as heat in the universe and is increasing. this has been shown to be residual radiation from the big bang. what error did the scientist make?