Concentric rings with pie layout

Built with blockbuilder.org from this original jsfiddle: http://jsfiddle.net/Qh9X5/154/

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
  <style>
 
    svg { width: 100%; height: 100%; }
  
    body {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  margin: auto;
  position: relative;
  width: 960px;
}

text {
  font: 10px sans-serif;
}

form {
  position: absolute;
  right: 10px;
  top: 10px;
}
  
  </style>
</head>

<body>
  <script>
  
  // could make array of event data with each event a length of one and intervals the length of intervals?
  var dataset = {
  apples: [10, 6, 8, 6, 4, 1],
  oranges: [10, 6, 8, 6, 4 ,1],
  lemons: [10, 6, 8, 6, 4, 1],
  pears: [10, 6, 8, 6, 4,1],
  pineapples: [10, 6, 8, 6,4,1],
};

var width = 460,
    height = 300,
    cwidth = 25;

var color = d3.scale.category20();

var pie = d3.layout.pie()
    .sort(null);

var arc = d3.svg.arc();
 
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height)
    .append("g")
    .attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");

</script>
</body>

https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js