Which procedure most closely resembles "milieu teaching?"

Which procedure most closely resembles "milieu teaching?"

• Fiona requests a ball from her teacher who asks "What do you want to do with the ball?" The teacher gives Fiona the ball only when she replies to the question.

• Fiona requests a ball from her teacher who says "There are fun things to do with a ball!" The teacher then gives Fiona the ball.

• Fiona requests a ball from her teacher who asks "What do you want to do with the ball?" The teacher waits five seconds, then gives Fiona the ball whether she replies to the question or not.

• Fiona's teacher tells her to play with a ball, then observes her playing and waits for opportunities to interact verbally with her.