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Question
Alice is participating in a research study in which she completes a questionnaire every year. She has been doing this for the past five years, and the purpose of the research is to study how consumers' attitudes and preferences toward various food products change as they age. This type of study in which respondents are questioned at multiple points in time is called a _____.A.cross-sectional study
B.longitudinal study
C.permanent study
D.structured study
Answer
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