Which one of the following is a possible matching of employees with the offices they select?

The video explanation is not working (and I've seen other users with the same issue, so it is not a problem on my end) I do not know when this issue will be fixed, so in the meantime, could someone explain the best set up for this game? I couldn't find any way to make predictions, so I ended up just running through each possibility on each question. Of course, this was way too time consuming. Are there any initial inferences that can be made? What should I have had on my scratch paper before reading the first question? Thanks