Drag and drop shows all answers as incorrect
I created a drag and drop exercise where all the answers are correct, and all trigger an audio layer that discusses the choices (all three answers are correct; the purpose is to get the student to think about and indicate their primary reason). I converted the slide to freeform and created a box and filled it with a mostly transparent fill to serve as the drop target. However, all three answers show up as incorrect. I have tried fiddling with the box and the controls - nothing I get shows any of the answers as correct. Your help is appreciated - this is my first story.