After watching cartoons in which characters hit, punch and kick other characters, nursery school students engage in more aggressive behavior than after watching Barney. This observation best supports:
1) Children imitate the behavior they see in cartoons
2) Watching Barney has a calming effect on nursery school students
3) Nursery school students should not be allowed to watch cartoons
4) Cartoons have a negative impact on the behavior of nursery school students