Use the Following to Answer Question

Multiple Choice

Use the following to answer question:
-(Figure: Marginal Benefits and Marginal Costs) Use Figure: Marginal Benefits and Marginal Costs.More time spent studying economics adds points to economics scores (MB) but subtracts points from accounting scores (MC) .At 4 hours of study,Claudia will maximize her benefit from study time because:

A) MB > MC.
B) MB = 20 and MC = 5.
C) the difference between total benefits and total costs is maximized.
D) sunk costs are minimized.