[单选题]
A material with a mass oz oj2ju gws-ilo91/( wq/.vbuf m is heated. The graph shqf*8f( x 0fslxows the variation of the temperature of the material wits*f8 fxl 0q(fxh the energy supplied.
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. $\frac{E}{m(T_2-T_1)}$