Find the Slope of the Curve at the Indicated Point $0.33 \mathrm {~mm}$

Multiple Choice

Find the slope of the curve at the indicated point.
-A cubic salt crystal expands by accumulation on all sides. As it expands outward find the rate of change of its volume with respect to the length of an edge when the edge is $0.33 \mathrm {~mm}$ .

A) $0.11 \mathrm {~mm} ^ { 3 } / \mathrm { mm }$
B) $32.67 \mathrm {~mm} ^ { 3 } / \mathrm { mm }$
C) $0.3267 \mathrm {~mm} ^ { 3 } / \mathrm { mm }$
D) $3.27 \mathrm {~mm} ^ { 3 } / \mathrm { mm }$