[单选题]
What is the value for the gradient of the graph belz , fpyn1rcce kll/3mxz4)o /z9o6r h4ow with theejsovqvg (q -w2:x9b1 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
