It is widely believed that eating chocolate can cause acne. Indeed, many people who are susceptible to acne report that, in their own experience, eating large amounts of chocolate is invariably followed by an outbreak of that skin condition. However, it is likely that common wisdom has mistaken an effect for a cause. Several recent scientific studies indicate that hormonal changes associated with stress can cause acne and there is good evidence that people who are fond of chocolate tend to eat more chocolate when they are under stress. Of the following, which one most accurately expresses the main point of the argument? ['People are mistaken who insist that whenever they eat large amounts of chocolate they invariably suffer from an outbreak of acne,', 'Eating large amounts of chocolate is more likely to cause stress than it is to cause outbreaks of acne.', 'The more chocolate a person eats, the more likely that person is to experience the hormonal changes associated with stress.', 'It is less likely that eating large amounts of chocolate causes acne than that both the chocolate eating and the acne are caused by stress.']