Choose the One Alternative That Best Completes the Statement or Answers

Multiple Choice

Choose the one alternative that best completes the statement or answers the question.
-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 $3 \mathrm{ohms}$ . What would the resistance be for a 42 foot length, with diameter $0.01 \mathrm{inch}$ , of the same kind of wire ?

A) $3.8 \mathrm{ohms}$
B) $18.3 \mathrm{ohms}$
C) $-0.7 \mathrm{ohms}$
D) $6.3 \mathrm{ohms}$