Answer:
none of the above. (Talk to your teacher about this question.)
Explanation:
The differences between length and width are 4, 6, 12, so are not constant at either 4 or 6.
The ratio of width to length is 2/3, 2/3, 3/5, so is not constant at 2/3 or 3/2.
None of the answer choices (even after editing to add appropriate math symbols) describes the relation between length and width.