Use the Following to Answer Questions

Multiple Choice

Use the following to answer questions:
Figure: Marginal Benefits and Marginal Costs
-(Figure: Marginal Benefits and Marginal Costs) Look at the figure Marginal Benefits and Marginal Costs. More time spent studying economics adds points to economics scores (MB) but subtracts points from accounting scores (MC) . The marginal benefit of studying economics for four hours is _____ points, and the marginal cost is _____ points.

A) 30; 30
B) 20; 10
C) 20; 20
D) 30; 10