In the quadrilateral PQRS, side PS is parallel to side QR

[rhitian]

Really glad I found this discussion because I was convinced that A cannot be sufficient. I just drew ps and qr with a 1 inch vertical as well as horizontal offset and could not figure out how could it be a parallelogram each time until one of the posts suggest i try and connect them. I tried a number of lengths and offsets before the bulb finally lit up. please consider having a better explanation in the CAT answers because right now.. it does Not help.

[jnelson0612]

Glad that you are squared away now.