Bond angles helpWatch
Two of the possible answers were out of question because they only had one or two electron domains, so I was left with two possible answers.
One was “three angles of 120°” and the other was “two angles of 90° and one of 180°”. Since they both have three electron domains they both could have had an sp2 hybridization. I could not think about any other reason to choose one answer over the other but the fact that one of the two had to be a molecular geometry that did not exist at all.
I knew trigonal planar had three bonds at 120°, so I asked, just to make sure, if the other one existed at all.