Some researchers have found that children who watch more TV violence also tend to be more aggressive. Which of the following poses one of the major problems with interpreting the finding as an indication of media effect on children?a. There is no way to tell if watching violence on TV causes aggressive behavior orif aggressive children are drawn to programming with more violence. b. Parents are the only source of data regarding children's aggressive behavior. c. Even cartoons for very young children contain some level of violence so allchildren are exposed to violence on TV. d. There is no way to objectively measure the amount of violence on TV programs.