Related to theEconomics in Practiceon page 10: Prior to joining a fraternity, James spent most of his evenings and weekends studying for his classes. Once he joined the fraternity, James spent a majority of his evenings and weekends going to parties. This change in behavior is best described by

A.) the fallacy of logic.

B.) the problem of causality.

C.) the ceteris paribus error.

D.) the post hoc ergo propter hoc fallacy.