jQuery: Get and Set a Checkbox Value

HTML

<script src="https://code.jquery.com/jquery-2.2.4.min.js"></script>
<table>
  <tr>
    <td id="the-cell">
      <label>
        <input type="radio" name="pt" value="o" checked="checked" />
      </label>
      <label>
        <input type="radio" name="pt" value="c"/>
      </label>
    </td>
  </tr>
</table>

<div>
  <button id="btn">reset</button>
</div>

JavaScript

$(function () {
	var c = $("#the-cell");
	$("#btn").on("click", function () {
    $("input:radio[name=pt]:first").prop('checked', true);
  });
});