Some people claim they can get relief from migraine headache pain by drinking a large glass of ice water. Researchers plan to enlist several people who suffer migraines for a test. When a participant experiences a migraine, he or she will take a pill that will either be a standard pain reliever or a placebo. Additionally, half of each of each group will drink a large glass of ice water while the other will just sip a little water with the pill. Participants then report the amount of pain relief. In this experiment, what is the response variable? O a. type of pill O b. time until headache C. amount of pain relief O d. temperature of water

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