Hi Renga.g,
Here is a sample i have created using your html design :-
I have taken only one div for example and 'Add Option' button can add more divs with next letter.
<form id="form1" runat="server">
<div id="Div_B">
<div>B : <input onclick="javascript:noCheck_B();" name="answer" type="radio" id="Radio_B" style="display: table-cell;padding:0px;margin:0px; vertical-align:middle" />
<div style="display: table-cell;padding:0px;margin:10px;vertical-align:middle" class="rich-text-wrapper"> <textarea class="input-xxlarge">Answer B
</textarea></div></div><br />
<div id="Facet_B">Facet:
<select style="width:540px; margin-top:5px">
<option value="1">Select Facet</option>
<option value="2">01. The student determines distance ny adding two or more positions during the motion.</option>
<option value="3">02. The student does not distinguish position and/or distance from speed.</option>
<option value="4">03. The student views a position or speed graph as a map of the actual motion.</option>
</select>
</div>
</div>
<input id="btnClone" type="button" value="Add Option" />
</form>
Here is the Javascript code to add the new div on click of 'Add Option' button.
Ex :-
$(function () {
$('#btnClone').click(function () {
var allDivs = $(document).find("div[id*='Div_']");
var lastDivID = allDivs.last()[0].id;
var currentLetterCode = lastDivID.split('_')[1];
var c = currentLetterCode.charCodeAt(0);
$('#' + lastDivID).clone().attr("id", "Div_" + String.fromCharCode(++c)).insertBefore($('#btnClone'));
});
});
Hope this will definitely of help.