The graph below represents the Production Possibility Frontier for the country of Sandia for 2 groups of goods or services: Infrastructure (like bridges and roads) and technology and research. Graph of the Production Possibility Frontier for the Country of Sandia. The x-axis charts infrastructure projects, and the y-axis charts technology and research projects. The curve of the PPF descends from left to right and contains the following points: (0,10), (1,9), (2,7), (3,4), and (4,0). The Production Possibility Frontier of Sandia illustrates the law of diminishing returns because... Group of answer choices The opportunity cost of producing additional infrastructure projects is higher when Oz is already producing 3 than when it is producing 2 infrastructure projects. The opportunity cost of producing additional infrastructure projects is higher when Sandia is already producing 2 than when it is producing 3 infrastructure projects. The opportunity cost of producing technology and research projects is falling as more technology and research projects are produced in Sandia. Sandia needs less and less resources to produce additional infrastructure projects because of greater expertise.