Forgot Security Questions

If you forgot security questions use a web browser and open iforgot.apple.com and enter your Apple ID , click on continue .

Check the box of I need to reset my security questions , click on continue and enter your Apple ID password .

Again click on continue then check the box of answer your security questions you choose when Apple ID was created and click on continue .

A security question will be written in the field , you can click on drop arrow the three questions that you created when apple id was created will be visible .

If you are being told there isn't enough information to reset them,contact Apple ID Support, although based on multiple posts I have read, they will not help you recover the answers to your security questions.

From the article below. 

Without proof of your identity via security questions and other carefully selected criteria, Apple Support can't help you reset a password or perform any other actions on your account. These policies are audited and reviewed on a regular basis.

Security and your Apple ID.    

Apple ID - Official Apple Support.    

Contact Apple for help with Apple ID account security - Apple Support.   (Link doesn't always load)  

Get Support    Work through the screens to get a chat option. 

Apple Support schedule phone call

https://twitter.com/AppleSupport