Round to the Nearest Tenth Unless Indicated Otherwise $0.1$ Inch Has a Resistance of 3 Ohms What Would the of a Wire

Multiple Choice

Round to the nearest tenth unless indicated otherwise.
-The resistance of a wire varies directly as the length of the wire and inversely as the square of the diameter of the wire. A 20 foot length of wire with a diameter of $0.1$ inch has a resistance of 3 ohms What would the resistance be for a 21 foot length, with diameter $0.01$ inch, of the same kind of wire ?

A) $308 \mathrm { ohms }$
B) $327 \mathrm { ohms }$
C) $312.5 \mathrm { ohms }$
D) $315 \mathrm { ohms }$