6. The final exam will be held after ten days. Lee Tian-Tsai chooses four courses in this semester. The credits are Chinese 4 credits, English 4 credits, Civil Law 2 credits, China General History 2 credits. Student Lee wants to maximize his average score (the average score is calculated as the sum of the product of the subject test scores and the credit score, and then is divided by the total credit score). He knows that he prepares for each subject the more one day, how the subject's score will increase. However, he does not know how to allocate his time to prepare for the four subjects. He has learned that you are the best man in calculating because you are major in economics. How do you use What kind of economic concept for you to choose to answer this question to Lee Tian-Tsai.
(A) Economies to scale.
(B) Decreasing marginal returns.
(C) Opportunity cost.
(D) Compare advantages.
(E) Normal profit.

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