Which Statement CANNOT Be Concluded from the Systematic Observation That

Which statement CANNOT be concluded from the systematic observation that children who watch televised aggression act violently?

A) Exposure to televised aggression should be manipulated before measuring the aggression levels of children.
B) Exposure to televised aggression is likely to lead to aggressive behaviour in children.
C) Exposure to televised aggression is a dependent variable.
D) Exposure to televised aggression and aggression levels of children are positively correlated.