I think E
Question is basically asking is X<Y?
(A) says X+Y>0 which could be anything not suff
(B) At this point I started plugging in numbers.
If they are both positive, then X<Y. If they are both negative, then X>Y not suff
Try X=-3, Y=5. This meets criteria for both A and B, and X<Y. Now try X=5, Y=-3. This works fine as well for both A and B, but X>Y
This took me about 3 mins, and I am still not 100% confident of my answer. I felt myself holding a lot of information in my head for this one, which I hate to do.