[单选题]
What is the value for the gradient of the 3ul4(m zmhl*jxvf 74g graphr/y,yf/t tq*z5 tbxzy 4ql-)bbk; 9ay below with the correct units?
A. Gradient is $\frac{303-183}{25-13}$;Units is dm$^{3}$K$^{-1}$
B. Gradient is $\frac{25-13}{303-183}$;Units is dm$^{3}$K$^{-1}$
C. Gradient is $\frac{183-303}{25-13}$;Units is dm$^{3}$K
D. Gradient is $\frac{13-25}{303-183}$;Units is dm$^{3}$K
