Yes the assumption unstated is that "as a family" is less pervasive. But ac-A comes in and contradicts this assumption and weakens (perhaps destroys) the argument. Good analysis :-)
Also I don't know if this is appropriate or not, but Kaplan does offer test 56 for free online. Again if it is not appropriate to mention this here sorry, just trying to help :)
PT 9 S3 Game 3 - The School dance game. The sort of game that I would have lost my shit on had it been on the real deal, but taking the time to split the game boards and make all necessary inferences makes the questions a breeze