Suppose Andrea is taking just two courses and is at a point inside her PPF of grades for those two courses. If Andrea changes her work habits then it is impossible for

A) either one of her grades to rise.
B) both of her grades to rise.
C) both of her grades to fall.
D) either one of her grades to rise while the other grade remains constant.
E) none of the above is impossible in this situation


E

Economics

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