Irene wants to examine the effect of a defendant's appearance on the judgment of guilt for a crime.She has participants read an identical account of the crime except for the defendant's appearance.A group of high school students receive the description of an attractive defendant,while a group of senior citizens receive the description of an unattractive defendant.Both groups are then asked to rate the defendant's guilt on a seven-point scale.A major cause for confusion in Madison's experiment is the _____.A) manipulation of appearanceB) measure of guiltC) description of the crimeD) age of the participants