$A$ sheet of steel is $40 \ cm$ long and $5 \ cm$ broad at $0^{\circ} C$. The surface area of the sheet increases by $1.4 \ cm^2$ at $100^{\circ} C$. The coefficient of linear expansion of steel is:
- A$1.9 \times 10^{-5} /^{\circ} C$
- B$2.4 \times 10^{-5} /^{\circ} C$
- C$3.5 \times 10^{-5} /^{\circ} C$
- D$7 \times 10^{-5} /^{\circ} C$
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