In a study of the relationship between aggression and television viewing in nursery school children, many interesting interactions among family styles, aggression, and television viewing were found. High aggression occurred in both high-viewing and low-viewing children and this seemed to be related to parental lifestyle. High-achieving, competitive, middle-class parents, whose children did not watch much television, had more aggressive children than parents who planned their lives in an organized, child-centered way, which included larger amounts of television viewing. Which one of the following conclusions is best supported by the passage? ['If high-achieving, competitive, parents were more child-centered, their children would be less aggressive.', 'Low levels of television viewing often lead to high levels of aggression among children.', 'The level of aggression of a child cannot be predicted from levels of television viewing alone.', 'Parental lifestyle is less important than the amount of television viewing in determining the aggressiveness of children.']