Find the Slopes of the Lines That Are (A)parallel and (B)perpendicular

Multiple Choice

Find the slopes of the lines that are (a) parallel and (b) perpendicular to the line through the pair of points.
-(-3, -1) and (1, 7)

A) 2; - $- \frac { 1 } { 2 }$
B) 2; - 2
C) - 2;; $\frac { 1 } { 2 }$
D) $\frac { 1 } { 2 }$ ;; - 2