Feeling safe while walking your vicious dog through a dangerous neighborhood is an example of

Which of the following is NOT an example of someone actively creating an environment?

A) John was born into a large family, and he likes this because he has lots of siblings to play with, study with, and talk with. B) John chooses to play competitive sports despite the fact that he sometimes gets injured, because he loves the adrenaline rush and the cheers of the crowd. C) John picks his friends carefully because he doesn't want to hang around with people who are always getting into trouble. D) John spends every Sunday with his grandmother because he enjoys hearing her tell stories of the "old days." E) John broke up with his girlfriend because he felt their goals in life were too dissimilar.

In an experiment, researchers exposed half the children to 2 hours of violence on television every day for a month and made sure the other half saw no violence on television at all. At the end of the month, they measured the level of aggressiveness in the children. What is/are the independent variable(s)?

A) the level of aggressiveness at the end of the month B) the amount of violence watched on television C) the level of aggressiveness at the end of the month and the amount of violence watched on television D) the children