The length and area of cross-section of a copper wire are respectively 30 m and $6 \times 10^{-7} \mathrm{~m}^2$. If the resistivity of copper is $1.7 \times 10^{-8} \Omega \mathrm{~m}$, then the resistance of the wire is

• A

  $0.51 \Omega$
• B

  $0.68 \Omega$
• Correct answer
  C

  $0.85 \Omega$
• D

  $0.75 \Omega$

Hence, the correct answer is option: 'C'.