A Researcher Wants to Determine the Cause of Intoxication

Multiple Choice

A researcher wants to determine the cause of intoxication.On successive days, he consumed large quantities of scotch and water, bourbon and water, and vodka and water.Becoming very intoxicated in each case, he concluded, "It's the water that makes one drunk." The researcher should have consumed pure water on one of his test days.The water alone test would be called a

A) double blind.
B) hypothesis.
C) prediction.
D) control.