Jim: I hear that the company is considering giving Fred and Dorothy 25 percent raises.
Jim's Conclusion
If my salary isn't raised to match theirs, then it's unfair to raise their salaries.
Jim's Evidence (since)
I've worked at the company longer than Fred and Dorothy. Their raise would make their salaries higher than mine.
Tasha's Position
Then by that logic we'd have to give 35 other employees raises, since they've been here as long as you and make what you make.
Evaluate
It's an odd task, to pick a principle that works for both arguments. It might feel easier to just focus on one person's argument, make a first pass through the answers and eliminate what we can and then compare the remaining options to the other person's argument.
Goal
Jim's is pretty easy to prephrase,
Tasha's is more like,
Both of them relate to tenure and pay disparity, but it's hard to predict the wording of an answer that would help both of them.