The Poisson's ratio of a material is \( 0.4 \). If a force is applied to a wire of this material...

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The Poisson's ratio of a material is \( 0.4 \). If a force is applied to a wire of this material, there is a decrease of cross-sectional area is \( 2 \% \). The percentage increase in its length is
(a) \( 3 \% \)
(b) \( 2.5 \% \)
(c) \( 1 \% \)
(d) \( 0.5 \% \)
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