Caroline Is Participating in an Experimental Study in Which She

Multiple Choice

Caroline is participating in an experimental study in which she is taking an herbal supplement and the researcher measures her perceived energy levels for several weeks.Although she doesn't know it,the supplement she is given in the study does not contain the herb of interest.However,Caroline feels as though she has more energy than before,and she attributes it to the herbal supplement.This effect is called a(n) ____.

A) maturation effect
B) false positive
C) counterbalancing effect
D) placebo effect