Hi Jon,
When you write "4 possible answer choices as well as explanations for each" I suppose you mean "4 possible answer choices as well as feedback for each"?
The fact they were originally created in GIFT does not matter.
You write "we want the student to be able to see all four answer choices (not just the correct one) when they review the quiz" I suppose you mean you want the student to be able to see the feedback for all 4 answer choices?
Could you post in your reply: a sample exported question and a copy of your quiz settings?