Answer to be posted in a couple of days
This Quiz follows from the same example as Quiz #17 before it. The big thing you need to remember is that the contents of the trace are irrelevant. What is relevant to the question are the various sections of the trace: A, B, and C, and that the trace was created via a formal verification tool.
Section “C” is the last formal time step in the trace, section “B” is the singular timestep before that, and section “A” is everything else.