Two straight lines pass through the origin (x,y) = (0, 0). One of them passes through the point (x, y) = (1, 3) and the other passes through the point (x, y) = (1, 2). What is the area enclosed between the straight lines in the interval [0, 1] on the x-axis? (a) 0.5 (c) 1.5 (b) 1.5 (d) 2.0