As for your problem, be sure to define only the one answer as correct answer, you need no individual object actions. And trigger the advanced action for the Success event of the Drag&Drop (which is in the Actions tab).
My blog is for 90% about advanced and shared actions Also presented several webinars about them for Adobe that you can find On Demand.
Planned to write cookbooks about advanced and shared actions, but Rod Ward published a global book, so just quit that plan. Everything on my blog is free, thousands of hours work.