Card 28 / 54: Prof. Higgins agrees that Sam's data might have the confound pointed out by Prof. Karpathy. When they return from the conference, Prof. Higgins asks Sam to redo the experiment. What must she do differently this time to avoid the confound Prof. Karpathy mentioned?
A) Use random assignment of participants to groups
B) Use a double-blind design
C) Use a larger sample size
D) Use a different dependent variable

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