Caroline needs to find information about income and age distribution in Orange County,California.The best source of secondary research of use to Caroline is likely to be

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The best source of information about income and age distribution in Orange County, California would be the U.S. Census data as it provides comprehensive and reliable demographic data for the entire country, including specific regions and counties. Door-to-door surveys and focus group interviews may not have a representative sample, and sales invoices at public libraries would not provide relevant data. Syndicated data may provide some useful insights, but their scope and accuracy may not be as extensive as the U.S. Census data.

Caroline Needs to Find Information About Income and Age Distribution