A Media Psychologist Conducts a Study of Adolescent Television Viewing

A media psychologist conducts a study of adolescent television viewing and its effects on violent behaviour.He recruits a sample of 300 teenage males and measures their TV viewing behaviour over a period of six months by asking them to press a button on a device whenever they are watching TV (which automatically notes what the programme is) .At the beginning, middle, and end of the study he brings the adolescents into the media laboratory and measures violent behaviour (the number of times they punch inflatable dolls that resemble members of a well-known "boy band") .Which of the following statement is true?

A) The study is an experiment because it is conducted in a laboratory.
B) The study is not an experiment because even though it is conducted in a laboratory it is a "media" laboratory and media is not scientific.
C) The study is an experiment because it employs a repeated-measure design.
D) The study is an experiment because it has never been done before.
E) None of the above.