Finding the C line

How do I find the C line for this model? I am thinking about the past where I was working on a proposal and he said to include budget for buying stock photography. I think this is what happened, anyway. I can’t quote anyone or anything, so how could I get the C line?

T: I was so fucking stupid
F: shame
A: ruminate, criticize myself in my mind about all the things I did wrong in that job
R: My brain is great at finding evidence that I am stupid and do everything wrong