A for execution.
C for situational play calling.
Too many times we run a motion or a shift and bring extra defenders right to where we are running. I remember specifically a play where we ran toss and they had us so out numbered that we needed up having 1 guy to block 3 at the point of attack. That's either a bad call by limegorover or a bad check by the QB. In any case, it makes me say B overall.