How can I reduce duplication of radio buttons?

1. What are radio button alternatives?
2. Should radio buttons be stacked?

What are radio button alternatives?

Radio buttons and checkboxes are very similar, except for a few key differences. The primary difference is that with radio buttons you can only select one item, while with checkboxes you can select any number.

Should radio buttons be stacked?

Based on research from the Neilson Norman Group as well as the various human interface guidelines for Apple and Microsoft, radio buttons should have the circle to the left of the label, and the list should be stacked vertically.