The ice and steam points of a mercury-in-glass thermometer of centigrade scale and of uniform bore correspond respectively to \(3 \mathrm{~cm}\) and 19 em lengths of the mercury thread. When the thread is \(12 \mathrm{~cm}\), the temperature is ____________

A. \(32^{\circ} \mathrm{C}\)
B. \(48^{\circ} \mathrm{C}\)
C. \(56^{\circ} \mathrm{C}\)  
D. \(65^{\circ} \mathrm{C}\)
E. \(75^{\circ} \mathrm{C}\)

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Correct Answer: C