// name must match accross all elements to logically group them
<div>
  <Formfield>
    <Radio id="radio-1" name="Basic Options" />
    <label for="radio-1">Radio 1</label>
  </Formfield>
  <Formfield>
    <Radio id="radio-2" name="Basic Options" />
    <label for="radio-2">Radio 2</label>
  </Formfield>
  <Formfield>
    <Radio id="radio-3" name="Basic Options" />
    <label for="radio-3">Radio 3</label>
  </Formfield>
</div>