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 the A. slope of the isocost lines will​ change, and the firm will substitute ​, pivoting the expansion path toward the axis of the relatively more expensive input. B. slope of the isoquants will​ change, and the firm will substitute ​, pivoting the expansion path toward the axis of the relatively input. C. isoquants will shift in a parallel​ fashion, and the firm will substitute ​, pivoting the expansion path toward the axis of the relatively input. D. slope of the isocost lines will​ change, and the firm will substitute ​, pivoting the expansion path toward the axis of the relatively cheaper input. E. 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.