I'm not sure how B follows A
Ever seen a consumer recycling operation? It's a miserable, dangerous, low paying job mostly staffed by illegals because rather than pay worker's comp the company can get them deported (much like the meat industry), the sooner it's automated the better. Plastics are particularly problematic for them, because while almost all of them have the "recyclable" symbol on them it's difficult to tell the various types apart so most of them get incinerated.
Robots and AI can sort and separate different types of materials far faster, more efficiently and more accurately than humans. New spectrographs can analyze a fragment of something almost instantaneously, allowing separation of the various types of plastics. All three innovations are already being used in commercial recycling in Europe (like construction waste and factory scraps). Consumer recycling is a considerably more difficult nut to crack, but China seems poised to make it work. It will be interesting to see.