If lines were drawn through the following
pairs of points, which lines would have
undefined slopes? Circle all that apply.
A. (1, 5) and (1, 7)
B. (2, 6) and (4, 6)
C. (−3, 2) and (−3, −3)
D. (1, −6) and (0, −6)
E. (0, 1) and (0, 10)