<select name="Cause">
<option value="">不限</option>
<optgroup label="賣家投訴買家">
<option value="1">出價不買</option>
<option value="2">發貨不付款</option>
<option value="3">惡意評價</option>
</optgroup>
<optgroup label="買家投訴賣家">
<option value="21">付款后不發貨</option>
<option value="22">物品與描述不符合</option>
<option value="23">惡意評價</option>
</optgroup>
</select>