a
Since breaking stress (Maximum lifting capacity) is the property of material so it will remain same. breaking stress \(=\frac{\text { Maximum lifting capacity }}{\text { Area of cross section of rope }}\) \(\frac{10}{2.5 \times 10^{-4}}=\frac{25}{ A }\)

\(A =625 \times 10^{-6}\)

\(=6.25 \times 10^{-4} m ^{2}\)