Which of the following is an example of a longitudinal design in a descriptive research project?
A) Surveys involving 600 mall intercepts in six major cities to determine the likes and dislikes of health food.
B) A variety of promotional offers would be displayed in stores, with each group of respondents seeing only one offer and the resulting brand sales would be monitored.
C) A panel that consists of households that provide purchasing information at specified intervals over an extended period.
D) A and B only
E) B and C only
C
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