What is the scale factor of the dilation?

J (−3, −2) K(−1, −2) L(−1, 2) M(3, 2)
J' (−6, −4) K'(−2, −4) L'(−2, 4) M'(6, 4)


A. 2
B. 1/2
C. -1/2
D. -2