I'd answer: "D - all of the above."
I guess if we're talking trauma, you could call it memories, triggers or flashbacks. My triggers are either waves of fear and discomfort or shame-based flashbacks. When a shameful memory is triggered, it can be is so intense, I have to disguise my shame by rubbing my eyebrows/nose, but other times it's so intense, I actually cover my face with both my hands in the middle of the supermarket/street, even if it's a memory from first grade.
After spending Christmas on my own for many years, this year I visited my parents for the holidays, while they were looking after my small nephews/nieces, I noticed my mother's constant attempt to get their attention/affirmation and my father constant annoyance and frustration. I felt like, I got an outside glimpse into my own early childhood. I felt great unease, but I also feel that, some of my early and insecure memories was confirmed and validated.
CBT and group therapy has been very beneficial for me, I don't know, if I've work through it all, but I've become better at identifying and understanding what happens, when my thoughts and feelings are triggered and starts snowballing. It's not always possible to control my anxiety, sometimes I can sooth and decrease it, few times I stop it. A big difference is, I no longer lash out in anger at myself for freezing up or being controlled by fear. I now understand why I do this and that makes a big difference to me.
Best of luck CR.