Drag and Drop interaction not triggering by a click

I have created a drag and drop interaction.  The user must drag 3 different sentences in to the correct box.  The trigger states that when an object is dropped on the box, change the state.  Then the audio is triggered when the state of all 3 sentences are visited state.  The problem is the user can just click each sentence without actually dragging them into the boxes and the audio will play and the slide will progress.  How do I make it so the user cannot just click the sentences but actually have to drag them into the box?

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