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In which situation do both the state and federal governments have the authority to act concurrently?

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How does a change in the price of one input change the​ firm's long-run expansion​ path?If the price of an input​ changes, then theA.slope of the isoquants will​ change, and the firm will substitute toward the relatively cheaper input toward the relatively cheaper input​, pivoting the expansion path toward the axis of the relatively more expensive more expensive input.B.slope of the isocost lines will​ change, and the firm will substitute away from the relatively more expensive input away from the relatively more expensive input​, pivoting the expansion path toward the axis of the relatively cheaper input.C.isocost lines will shift in a parallel​ fashion, and the firm will substitute away from both​ inputs, shifting the expansion path in a parallel fashion.D.slope of the isocost lines will​ change, and the firm will substitute toward the relatively cheaper input toward the relatively cheaper input​, pivoting the expansion path toward the axis of the relatively more expensive input.E.isoquants will shift in a parallel​ fashion, and the firm will substitute away from the relatively more expensive input away from the relatively more expensive input​, pivoting the expansion path toward the axis of the relatively cheaper input.

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