[单选题]
A material with a mass i o2q1q9kq3ut(;ocu rj;:r3goqjw+l of m is heated. The graph shows o ,:y5*ljyd/;x i rvqa)xqem +the variation of the temperature of t5 ry xe+q; yx,o:dvlim*)/j aqhe material with 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. $\frac{E}{m(T_2-T_1)}$
