Based on 2-3-4-1a Player Possession, the ball would belong to Team B due to the definition stating "...a player has the ball firmly in his grasp by holding or controlling it while contacting the ground inbounds". Team B player has a hand on the ball, grasp, Team A is just laying on it. I have to say that my first thought was Team A possession. Review of Chapter 2 never hurts, now that season appears over for me, I have made myself an assignment, start with Chapter 2, then the rest of the book.