Is the relationship shown in the table proportional? If so, what is the ratio of dollars to months?

A table with 2 columns is shown. The first column is titled Months. The second column is titled Dollars.
First Row 2 100
Second Row 3 150
Third Row 5 250
Fourth Row 8 400
A. proportional; $150 per month
B. proportional; $100 per month
C. proportional; $50 per month
D.
not proportional

A. proportional; $50 per month