Which of the Following Is NOT an Example of a Sociological

Which of the following is NOT an example of a sociological hypothesis?

A) The more study halls students are given during the school day, the worse they perform on their tests.
B) The more CDs Jamilla buys, the less money she has in her bank account
C) The longer an inmate spends in prison, the more difficult it is for him to adapt to the outside world.
D) The more positive reinforcement a parent gives a child, the better they do in school.