Thank you for your willingness to help. Here is my .story file--I widdled it down to just a few slides (the ones that are throwing the incorrect error) since the original file is extremely large and confidential. Notice that the Acceptable Answers have several variations that would be deemed as "acceptable", including 16.A.3.d. (with a period at the end). The system is telling that is an incorrect answer, but it's listed as the first acceptable answer and is actually the truest version they could enter. Thank you for helping me solve this mystery.
