Click here for information. If the option to have the answers emailed to you isn't available or doesn't work(the email may take a few hours to arrive), contact the iTunes Store staff via the link in the 'Additional Information' section of that article.
Nobody on these boards can reset them for you.
The Three Best Alternatives for Security Questions and Rescue Mail
1. Use Apple's Express Lane.
Go to https://expresslane.apple.com ; click 'See all products and services' at the
bottom of the page. In the next page click 'More Products and Services, then
'Apple ID'. In the next page select 'Other Apple ID Topics' then 'Forgotten Apple
ID security questions' and click 'Continue'.
2. Call Apple Support in your country: Customer Service: Contact Apple support.
A substitute for using the security questions is to use 2-step verification: