Polygon EFGH is reflected and dilated to give polygon JKLM. The coordinates of the preimage are (1, 3), (5, 9), (11, 9), and (15, 3). The coordinates of the image are (7, 13), (5, 10), (2, 10), and (0, 13). What is the scale factor of the dilation? Select one:
a. Scale factor = 2
b. Scale factor = 3/4
c. Scale factor = 1/2