The diameter of a wire is reduced to \( 1 / 5 \) of its original value by stretching it. If its ...

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The diameter of a wire is reduced to \( 1 / 5 \) of its original value by stretching it. If its initial resistance is \( \mathrm{R} \), what would be its resistance after reduction of the diameter?
a. \( \frac{\mathrm{R}}{625} \)
b. \( \frac{\mathrm{R}}{5} \)
c. \( 5 \mathrm{R} \)
d. \( 625 \mathrm{R} \)
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