Ugh, I've been stuck on Route D and C for Dean and I can't figure out what the password on Day 10 is. I've looked at what Florencia says and noted any significant words but nothing works!
On day 10, pay attention to the conversation with Benson/Roswell towards the end of the day. Like with the other passwords Dave will notice when a word stands out.
The clue is thinking what the worst thing that could happen is, and if you've been down C/D you already know what exactly happens that night.