Problem: After conducting a preference assessment where Leo (patient) chooses marble run, Malik (technician) is running a Locations lesson with Leo. Malik sets out a field of pictures and says, "Give me grocery store" and Leo gives Malik the correct picture. Malik says, "Awesome, here are some marbles!" Leo takes the marbles and laughs as he sends them down the marble run. Malik picks up the marbles and says, "Okay ready? Cool. Give me school." Leo gives him the correct picture. Malik says, "Way to go! One more! Give me grocery store" Leo hands the correct picture to Malik. Malik says, "Nailed it! Here are some more marbles!" After Malik picks up the marbles, he runs three more trials of the Locations lesson before giving Leo the marbles. Which antecedent modification is being used? Need Assignment Help?