Given labor is on the horizontal axis and capital is on the vertical​ axis, as the price of labor​ increases, the isocost line becomes flatter . If both the price of labor and capital rise in the same​ proportion, which of the following will occur​ (holding production costs​ constant)? A. The isocost line becomes flatter. B. The isocost line makes a parallel shift inward. C. The isoquant makes a parallel shift outward. D. The isocost line shifts outward. E. The isocost line becomes steeper.