i forgot my security question on origin

Your best bet will be to contact an EA advisor to see they can help you reaccess your account.              

Steps to contacting an EA Game Adviser:

1 Click here to go to the EA contact page. http://help.ea.com/en/

2 Select your game and platform, Then click next.
3 Select a topic and write about your problem.
4 Click next and select your preferred contact method.
5 You can ask for a callback for a quick reply.

Or use this

You can contact EA here: http://help.ea.com/en/contact-us/

http://help.ea.com/ca/article/welcome-to-the-new-and-improved-ea-help-center/#contact