A recent U. S. study found that obesity is "socially contagious" and that it can be easily transmitted from one person to another, and that social ties affect the problem of obesity even more than the role of genes. Researchers believe that this is mainly due to Obese loved ones and friends have changed your standards for acceptable body weight, and you would consider their weight acceptable. Which of the following is true is most likely to question the researcher's explanation. ['Obese people are more likely to make friends with obese people.', 'The effect of genes on human obesity is actually uncertain.', "A person's eating habits are often influenced by family and friends.", 'Many people are obese due to stress in modern society, overeating, etc.']