3 Ways to Create Drag-and-Drops with Storyline 360

I am creating a drag-and-drop interaction where learners are dragging pieces of vegetables, fruit, grains, etc. to learn about correct portion sizes. There is a plat and six pieces of broccoli for them to drag and drop. The correct answer is three pieces of broccoli, but I have six pieces of broccoli in the answer bank. Is there any way to structure this free form drag-and-drop so that any of the six pieces of broccoli, as long as there are three on the plate, would count as correct? As I have it built now, I'm having to have three of the pieces of broccoli be incorrect, which would be confusing to the learner. I want them to be able to choose as many of the broccoli as they desire, but when they hit submit, it is only correct if there are three pieces of broccoli on the plate. Is that an option? Thank you!