Researchers Studying Factors That Influence How Much People Eat Gave

Researchers studying factors that influence how much people eat gave college students potato chips to eat while watching a movie.The potato chips were stacked in tubes.In some of the tubes,researchers inserted colored chips at regular intervals (e.g.,every 7^th chip) .Other tubes contained no colored chips.In this study,the use of potato chip stacks with colored chips represents

A) disguised observation.
B) a controlled-use trace.
C) a natural-use trace.
D) a product.

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