[ump50]

Following a home run by B2,S1 enters the batters box and does not report
His coach had wanted him to pinch hit for B4.Prior to the ball being made live.
the defense recognizes the situation and states that B3,who has left and
re-entered the game previously is now out of game
A. True,S1 has replaced B3
B. False, the ball had not yet been legally made live

I am confused if the ball has to be put to play or not to accept this play