Politician: A major social problem is children hurting other children. The results of a recent experiment by psychologists establish that watching violent films is at least partly responsible for this aggressive behavior. The psychologists conducted an experiment in which one group of children watched a film of people punching Bobo the Clown dolls. A second group of children was not shown the film. Afterward, both groups of children played together in a room containing a Bobo doll. Most of the children who had seen the film punched the Bobo doll, while most of the other children did not. Which one of the following, if true, most weakens the politician's argument? ['Some children who had not been shown the film imitated the behavior of those who had been shown the film and who punched the doll.', 'The child who punched the Bobo doll the hardest and the most frequently had not been shown the film.', 'Some of the children who did not punch the Bobo doll, including some who had been shown the film, chastised those who did punch the doll.', 'The children who had been shown the film were found to be no more likely than the children who had not been shown the film to punch other children.']