Dr John, in His Study Investigating the Effect of Stress

Dr. John, in his study investigating the effect of stress on consumption of carbohydrates, found that stress increased the consumption of carbohydrates. However, he also found that stress increased the desire to consume carbohydrates, the amount of time a person thought about carbohydrates, and the amount of time a person thought about eating. Because stress had the same affect on these other measures that were related to consumption of carbohydrates, the study had

A) outcome validity.
B) treatment variation validity.
C) dependent variable validity.
D) ecological validity.

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