Q: security question

If you have a rescue email address (which is not the same thing as an alternate email address) on your account then you can use that to reset them : http://support.apple.com/kb/HT6170

If you don't have a rescue email address then you will have to contact Support in your country to get the questions reset.

Contacting Apple about account security : http://support.apple.com/kb/HT5699

If your country isn't on that page then try this form and explain and see what they reply with : https://ssl.apple.com/emea/support/itunes/contact.html

When they've been reset (and if you don't already have a rescue email address) you can then use the steps on this page to add a rescue email address for potential future use : http://support.apple.com/kb/HT5620

Or, if it's available in your country, you could change to 2-step verification : http://support.apple.com/kb/HT5570