Jasmine divides her time between studying physics and studying economics. Her production possibilities curve for her final grade in each class is shown in the accompanying figure. The graph plots economics grade versus physics grade. A curve starts from the top left and ends at the bottom right of the first quadrant. Jasmine needs to earn at least an 80 in both economics and physics to keep her scholarship. Given her current PPC, an 80 in both classes is ______. Select one: a. efficient b. attainable c. unattainable d. inefficient