[单选题]
A material with a maos;t*3xw 8w qgsc:)4ywk et+2v- l hhbrs of m is heated. The graph shows the variation of the temperature of the material with the energy supplied. ):2v4chk+w-hbrlt ye Which one of the following gives the specific heat capacity of the material?
A. $\frac{2Em}{T_2-T_1}$
B. $\frac{Em}{T_1}$
C. $\frac{2E}{m(T_2-T_1)}$
D. $\frac{E}{m(T_2-T_1)}$
