A Researcher Plans to Conduct an Experiment to Test Whether

A researcher plans to conduct an experiment to test whether a cup of hot milk at night helps people fall asleep faster than usual. In this study, the independent variable is:

A) the amount of time it takes participants to fall asleep.
B) the consumption of hot milk at bedtime.
C) the number of participants drinking hot milk at bedtime.
D) the number of hours for which each participant sleeps.

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