While studying the impact of ginkgo biloba on memory, a researcher has one group of rats on a normal diet while the other rat group is given measured doses of ginkgo biloba with their meals. While observing the rats run a complicated maze, the researcher notes that the ginkgo biloba-enhanced rats' maze is more brightly lit than the normal diet rats' maze. The difference in lighting in this study is a(n)

A. confound.
B. independent variable.
C. dependent variable.
D. hypothesis.


Answer: A

Psychology

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