When creating trees, you have two distinct rendering options for the choices you give end-users: Horizontal Buttons and Vertical Panels.
Buttons style is best for short answers, where you can have multiple options per line. It looks like this:
Panels style is best for longer answers, and displays one option per line, like this:
How to Change Styles
You can switch to Buttons or Panels style, using the Settings tool, via the Rendering tab: