[单选题]
What is the value fo0e q,d6,pdq3ey6j n9p xnmtjg)df*u /r07z7 +)e95ez/jiqhw ev; hkybk7hko6nc, frd the gradient of the graph 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
