Susan, a researcher, conducts a study at a fruit and vegetable stand. She observes the stand's customers for a period of 3 days without their knowledge and notices that people are more likely to buy a bag of fruit and vegetables that they have sampled at random than those that have been sampled nonrandomly by the seller. Which statement is TRUE of Susan's observation?
A) The study is invalid, as the buyers were not informed of the expected outcome of the study.
B) Susan has failed to avoid demand characteristics in her study.
C) The buyers have considered random samples to be representative of the whole.
D) Susan has used a double-blind observation in her study.
C) The buyers have considered random samples to be representative of the whole.
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