$A$ negligibly small current is passed through a wire of length $15 \; m$ and uniform cross-section $6.0 \times 10^{-7} \; m^{2},$ and its resistance is measured to be $5.0 \; \Omega .$ What is the resistivity of the material at the temperature of the experiment?
- A$7 \times 10^{-6} \; \Omega \, m$
- B$6 \times 10^{-7} \; \Omega \, m$
- C$8 \times 10^{-7} \; \Omega \, m$
- D$2 \times 10^{-7} \; \Omega \, m$
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