Explanation

Resistivity is given by rho = RA/l, so its units are resistance times length: ohm-metre, or equivalently ohm.cm. Hence C. Resistivity is an intrinsic property of the material, independent of the conductor's shape or size. From the relation R = rho*l/A, rho has units of resistance multiplied by length. In centimetre-based units this is ohm.cm, which is exactly option C.