Consider a wire that has resistance r, length l and the cross-sectional area a. the correct expression for the resistivity of that wire is:

Explanation:

.As we know that the resistance of the wire is given as

here we know that

A = cross-sectional area

L = length

R = resistance of wire

now multiply both sides of above equation with Area

now divide both sides with length of the wire

so above is the expression of resistivity of wire in terms of resistance, Area and length of the wire

it is very well related to a lot of things but with my limited knowledge i can confidently say that the answer is space.