2015 ASA Umpire Exam questions

[tcannizzo]

31. With one out, R1 on 3B, R2 on 1B, B4 singles to right field scoring R1. R2 rounds second, then becomes confused, retouches 2B while moving back toward 1B where they are tagged out. The Umpires rule correctly that R1’s run counts as it was scored before R2 was tagged.
a.) True
b.) False

My question is who are "they"? Sounds like multiple tag outs, which would not only be R2 but also BR. But then question only mentions that R2 was tagged.
Which still means the run would count, but this may very well be the worst-worded question ever.