skill-assessment-app/app/views/quiz/_radio.html.erb

<%  answer_string = answer.try(:answer) || answer %>
<div role="group" aria-labelledby="<%= question.question_id %>">
  <div id="<%= question.question_id %>">Select the best option:</div>

  <%= form.collection_radio_buttons(:answer, question.input_options, :to_s, :to_s, {}, {class: ""}) do | option | %>
      <%
        option_id = "#{question.question_id}#{sanitize_to_id(option.value)}"
        checked = answer_string == option.value ? 'checked' : ''
      %>

      <div>
        <%= option.radio_button( id: option_id, checked: checked, data: { last: checked } ) %>
        <%= option.label(for: option_id) %>
      </div>

  <% end %>
</div>

<%= render partial: "quiz/answer_errors", locals: {question: question, answer: answer} %>