7. Mr. Nobita is very busy since his boss hands over a lot of things. Now Nobita's Mom wants him to accompany with her to see a doctor in the evening, while his girlfriend calls him to help her to move something. At this time, Nobita had to choice between his boss, mother, and girlfriend. At this point, what is the principle of economics should be considered.
(A) Full employment principle.
(B) Principle of diminishing marginal utility.
(C) Pareto optimum principle.
(D) The principle of constant short-term productivity.
(E) Economic rent minimization principle.
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統計: 尚無統計資料
統計: 尚無統計資料