A researcher was interested in whether watching violence affected children's behaviors. To examine this, he showed a violent film to one group of preschoolers and a nonviolent film to a second group of preschoolers, and then he observed their aggression levels. In this study, the independent variable was the: A. viewing of the violent film. B. level of aggression displayed before the film. C. level of aggression displayed following the film. D. children's home environment.

A. viewing of the violent film.

Explanation: Independent variables are variables that are not changed by other variables, any changes made to the independent variables affects other variables which are known as the Dependent variables.

In this case the independent variable is the viewing of violent film, independent variables are used in both Mathematical, statistical analysis to effectively analyse treatments or other variables which are to be considered.

the above statement/question is (true);

i feel as if they would both catch on before to long because they would see them to frequent