What do Ladouceur and his colleagues believe to be the key factor in the development and maintenance of problem gambling?

When someone uses negative reinforcement to change a behavior the behavior is likely to __________

a) occur less frequently b) occur more frequently c) occur at the same rate d) completely stop

Katie is a typical American ninth grader. It is most likely that Katie has tried

A) cocaine. B) tobacco. C) marijuana. D) alcohol.