[单选题]
A material with a mas y*fhgu3no2;m4 zbuc1s aww23: vh vbm8of m is heated. The graph shows the variation of the temperature of the material with the energy supplied.
83a b2hm vwwv: 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. $\frac{E}{m(T_2-T_1)}$