there are many utube before this one. Which goes through them.
You claimed earlier in the thread, and in this video itself, that the applications of physics to WC were in this video. I've no reason to assume you aren't making the same claims about the other videos. If they're all roughly five times the length they need to be like this was ...

I share what I know. The rest is upto others to take it or ignore it.
IMO, option B is the correct one.