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In steel, the Young's modulus and the strain at the breaking point are $2×{10}^{11}N{m}^{-2}$ and 0.15 respectively. The stress at the breaking point for steel is therefore

(a) $1.33×{10}^{11}N{m}^{-2}$                   (b) $1.33×{10}^{12}N{m}^{-2}$

(c) $7.5×{10}^{-13}N{m}^{-2}$                   (d) $3×{10}^{10}N{m}^{-2}$