GMAT Critical Reasoning (CR) | Re: Several studies have shown that individuals

Several studies have shown that individuals who dine frequently at fast-food restaurants are more likely to be obese than people who rarely eat at such establishments. In a recent examination of body-perception, health psychologists conducted a survey targeting two groups: high- and low-frequency fast-food eaters. To their surprise, the investigators found that approximately75% of both groups rated themselves as "at a healthy weight." Which of the following would best explain this finding?

A