Mike Is Maximizing Utility by Working 10 Hours a Week

Multiple Choice

Mike is maximizing utility by working 10 hours a week and studying 10 hours a week. Mike has only 20 hours to devote to either working or studying. If Mike realizes that another hour of studying will improve his grade on an exam, thus raising the utility of another hour of study, Mike will:

A) study less to raise the marginal utility of studying even more.
B) work fewer hours, moving him down along his labor supply curve.
C) work fewer hours, shifting his labor supply curve to the left.
D) substitute work for studying, raising his total utility.