The resistivity of iron is $1 \times 10^{-7} \, \Omega \cdot m$. The resistance of an iron wire of a particular length and thickness is $1 \, \Omega$. If the length and the diameter of the wire are both doubled, then the resistivity in $\Omega \cdot m$ will be:
- A$1 \times 10^{-7}$
- B$2 \times 10^{-7}$
- C$4 \times 10^{-7}$
- D$8 \times 10^{-7}$
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