quiz question not working

Hello,

I’m trying to add a quiz question to my contact form but it’s not displaying. What am I doing wrong? Would really appreciate any help that can be offered. Thanks!

Here’s the form code:

<div class="row">
    <div class="col-xs-12  col-sm-4">
       [text* your-name akismet:author class:required placeholder "Name (required)"] 
       [text your-company placeholder "Company"] 
       [email* your-email akismet:author_email class:required placeholder "E-mail (required)"]
    </div>
    <div class="col-xs-12  col-sm-8">
<p>Subject (required)
[select* your-subject include_blank "General Inquiry" "Apply to Work at S3"]
</p>
      [textarea* your-message placeholder "Message (required)"]
[quiz quiz-668 "What is 2+2?|4"]
      [submit class:btn class:btn-primary "SEND MESSAGE"]
    </div>
</div>

The page I need help with: [log in to see the link]