If you look at the underside of the ribbing, the purl stitches will look like knit stitches so you can see how many purls there are. Without being able to see the back, I’ll guess K1 P1.

Edited to change to K1 P1 when I looked again.

You're welcome.

Sorry, late to the party, but I agree it's definitely K1, P1. You can tell by following each rib up to the stockinette stitched area.

That's definitely K1P1 in the picture. Also, ribbing can be looser than other stitches so you may want to switch to a needle that is 1-2 sizes smaller for the ribbing.