Question: D Question 26 1 pts In an experiment to test the effects of vitamin B-12 on problem-solving performance, is the independent variable and is the

D Question 26 1 pts In an experiment to test the effects of vitamin B-12 on problem-solving performance, is the independent variable and is the dependent variable. problem-solving performance; the vitamin the vitamin; problem-solving performance O problem-solving performance; a placebo O a placebo; the vitamin

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