问题: WhydoestheauthormentiontheCaliforniagoldrush?
A: Toexplaintheneedforanincreasedsupplyofgold
B:ToindicatetheextentofUnitedStatesmineralwealth
C:Todescribethemoodwhenoilwasfirstdiscovered
D:Toarguethatgoldwasmorevaluablethanoil
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