Find the Slope of the Line Passing Through the Given $m = 3$

Multiple Choice

Find the slope of the line passing through the given points: A (8, 4) ; B (8, 7)

A) $m = 3$
B) $\frac { 1 } { 3 }$
C) $m = - \frac { 1 } { 3 }$
D) $m = 0$
E) m = undefined