Align your inputs on a single column towards the left side of the screen. Why? There are two reasons:

1. A single, vertical line is easier to follow.
2. Studies have shown that users in left-to-right languages tend to scan pages starting from the left part of the screen.^[1]

You can still use a horizontal layout, but your buttons and labels should be arranged so that users can tell without trouble which choice corresponds to which label.