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) .The marginal benefit of studying economics for 4 hours is _____ points,and the marginal cost is _____ points.
A) 30;30
B) 20;10
C) 20;20
D) 30;10
Correct Answer:
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