If this is count is valid, then triangle by rule is either a 4th wave or a B wave (or X). It defiinetely is not a 4, so if it plays as a triangle then it's a B... If it is a B, then there has to be a C...
Commento:
In my mind the big crash is definetely an A because it plays a zigzag with 4th wave right on point of wave 1, and A of the triangle retraces exactly 40% which is usual.