Forgot Apple ID security questions
How do I log in when I have forgotten my security questions?
[Re-Titled by Moderator]
Try using Apple's iForgot service.
If it says they don't have sufficient information, you need to set up two-factor authentication or contact Apple's Account Security team. To reach them, click here or here and pick a method; if you can't use any of those listed, choose one from this link.
(243686)