Researcher: The rate of psychological problems is higher among children of divorced parents than among other children. But it would be a mistake to conclude that these problems are caused by the difficulty the children have adjusting to divorce. It is just as reasonable to infer that certain behaviors that increase the likelihood of divorce -- hostility, distrust, lack of empathy -- are learned by children from their parents, and that it is these learned behaviors, rather than the difficulty of adjusting to divorce, that cause the children' s psychological problems. The assertion that children of divorced parents have a higher rate of psychological problems than other children figures in the argument in which one of the following ways? ['It is offered as evidence for the claim that certain behaviors are often responsible for divorce.', 'It is the claim that the argument tries to refute.', 'It is cited as an established finding for which the argument proposes an explanation.', 'It is the conclusion of the argument.']