Comments on https://lichess.org/@/shafen/blog/why-playing-bullet-chess-is-slowly-killing-your-brain-science-backed/cC7qQhW0
option D) 0
After a month of heavy addiction, I can happily say I'm bullet-free for over two months =)
GREAT ADVICE!
I played 3 games 2 days ago, played 15 games against stockfish level 8 in a 2 pawn vs 1 endgame so I say Option C