Two cylindrical wires of the same material have their lengths in the ratio 2 : 1 and their diameters in the ratio 1 : 3. The ratio of the resistance of thinner wire to that of thicker wire is:

1 : 9 1 : 18 18 : 1 9 : 1

18 : 1

The correct answer is Option (3) → 18 : 1