Problem with my survey form test

Hey community, I’m having a problem with my survey form test. I passed 16/17 but the issue is with the grouping of my radio buttons. This is my code pen link: https://codepen.io/lantech001/pen/OJzGaYz

Do you remember which attribute to use to group radio buttons together?

I didn’t remember at first, then I tried the name attributes and it worked.
Thanks for trying to help.