Set Up and Solve a Proportion for Each Application Problem $\frac{3 \text { feet }}{7 \text { feet }}$

Set up and solve a proportion for each application problem.
-Which of the following is not a ratio?

A) $\frac{3 \text { feet }}{7 \text { feet }}$
B) $\frac{12 \text { miles }}{7 \text { gallons }}$
C) $\frac{8 \text { miles }}{12 \text { miles }}$
D) $\frac{2 \text { gallons }}{5 \text { gallons }}$