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<select id="options">
<option>Option 1</option>
<option>Option 2</option>
<option>Option 3</option>
</select>
If you want to add a new option under Option 1, you would need to use the JQuery after function as example below
$("#options option:first").after("<option>New second option</option>");
The above will find the first option and then add the second option under the first option withing the select element with id options