With fear and trembling that the quilt police will find and arrest me... I confess that when this happens to my quilt I cut the border lengthwise of grain to avoid a seam. Of course this is dependant on having a long enough lengthwise piece left over to cut.

If I'm not mitering the corners, I always put the longest borders on first regardless of any seams in it. I then quilt something to hide the seam like a piano-key where I would stitch in the ditch on that seam.

Yes Mitty, the black cat I purposely cuddled up to his girlfriend. When I quilt the faces, I want to do one eye winking as well.:)

Please do not think I am a 'spoilsport' but I would miter (diagonal join) the corners on this quilt. I don't think I have ever done the 'A' thing because it seems to interrupt the length-width visual look and give a squat look. But, I think your beautiful cats deserve a border that is a frame look

B would be my vote.

I like B the best.

I think B is typically considered more the standard, and I usually do it that way. However, sometimes the size of the border fabric I have on hand makes A the more desired.

I love your cat quilt!

Dina

Will you have enough fabric to do B without piecing the top/bottom border? 36" + 4 + 4 = 44" If you are going to straight line quilt it, it really shouldn't make any difference. The seam will look like another line of stitching.
I would put a small (1") dark border on first to contain the colors in the quilt. With the yellow background and a yellow border, they will appear to bleed together, unless you want the cats to look like they are floating in the yellow. I would also quilt the corners with a diagonally.

I always do B.

I agree with Faintly Artistic about the diagonal piecing of the borders to make them stronger and less noticeable . I never piece straight across.