Adding Submit button with "Pick Many" question format

Cher Storyline Peeps

Looking for your inputs here.  I am using the "Pick Many" quiz format option.  However, I don't want to use the system generated "Submit" button.  I am a bit stumped on how to set the trigger/variable on the button.  The question requires the learner to get 3 out of 4 responses correct.  Do I need to set a variable for each possibility?

Your thoughts.
Thanks
Geraldine

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