True study: A study at the University of Rochester had heterosexual, non color-blind men rate a photo of a woman on attractiveness, intelligence, and personality. Some participants were randomly chosen to view a photo of the woman wearing a red shirt and others were randomly assigned to view a photo of the same woman wearing the exact same shirt, but in blue. The researchers found that participants who viewed the woman wearing a red shirt rated her as significantly more attractive (on a 1-7 scale) than participants who viewed the woman wearing the blue shirt. However, there were no differences in participants' ratings of the woman's intelligence or personality (also measured on a 1-7 scale). Answer the following questions based on this study description. 6. In the color-of-shirt study, the researchers are examining: a. 1 dependent variable b. 3 dependent variables C. 3 criterion variables d. 1 criterion variable