I actually found it "easier" and faster to do when I represented all of these as sets within sets (venn diagrams). Once I had the visual, it was straightforward to eliminate the answers that did not make sense and I was left with D, which was the only one I couldn't refute. It still took me more than the allotted 1-1.5mins, but if I did it the 7sage way (and was good at it), it would take me at least 5 minutes.