Reset Answer for Security questions.
I want to reset my answer for the security questions but I forgot the answers. I follow the instructions on how to reset the answer but there is no option for me to reset my answers.
If you can't reset your security questions
If you can't send a reset email, don't have a rescue email address, or can't access email at your rescue email address, call us for help. When you call, you might need to create a temporary support PIN to verify your identity. After you reset your security questions, you might want to update your rescue email address.
If you answer your security questions incorrectly too many times in a row, you temporarily can't access your account. You can try to reset your questions after the waiting period ends.
From here > If you forgot the answers to your Apple ID security questions - Apple Support