Rectangle ABCD with coordinates A(1, 1), B(4, 1), C(4, 2), and D(1, 2) dilates with respect to the origin to give rectangle A'B'C'D'. If A'B' = 6, what is the scale factor of the dilation?
A6
B3
C2
D1/2
E4
A6
B3
C2
D1/2
E4