7. Ethan measured the side length and perimeter of five squares, as shown in the table below. Side Length 2 3 5 6 9 Perimeter 8 12 20 24 36 Which of the following best explains why these values are or are not in a proportional relationship? A. They are proportional, because the perimeter always increases by the same amount from column to column. B. They are proportional, because the ratio of perimeter to side length is always 4:1. C. They are not proportional, because the side length increases by varying amounts from column to column. D. They are not proportional, because the difference between side length and perimeter is different for each column.