<div class="demo">
  <div class="form-check">
    <input type="radio" name="exampleRadiobox" value="option1" id="option1">
    <label for="option1">option1</label>
  </div>
  <div class="form-check">
    <input type="radio" name="exampleRadiobox" value="option2" id="option2">
    <label for="option2">option2</label>
  </div>
  <div class="form-check">
    <input type="radio" name="exampleRadiobox" value="option3" id="option3" disabled>
    <label for="option3">option3</label>
  </div>
</div>