From the internet search it seems to me that there is no way to get programmatically the 3 answers questions asked to prospective new members of a Facebook group.
So far I found that I am able to see the answers only when I see awaiting requests to join a group.
It might good enough to capture the answers. But how?
According to Facebook - This is currently not an option refer - FB Community Link
Alternatively, You Can Use Group Collector To Collect New Facebook Group Member Answers, Including Their Email And Save Them Into Google Sheet And Your Favorite Email Marketing Software Without Zapier.
Go to https://groupcollector.com/
You can also set up Group Collector Auto Approval, which allows you to auto-approve new group members after certain intervals that meet your specific criteria.
There are also other Chrome extensions to Capture the answers and store them in Excel Sheets.
Check