The Figure Shows a Graph of the Resistance of a Wire

The figure shows a graph of the resistance of a wire as a function of its length. What physical quantities does the slope of this graph represent?

A) the product of the resistivity and the cross-sectional area of the wire
B) the reciprocal of the resistivity of the material
C) the cross-sectional area of the wire
D) the resistivity of the material of which the wire is made
E) the resistivity of the material divided by the cross-sectional area of the wire