JSFiddle - React, Tailwind, and code Playground

HTML

<select id="Person1" class="demo-default" name="PERSONLIST" onchange="my_onchange_function_to_remove_2_and_3()">
            <option value="">Select a person...</option>
            <option value="4">Albert</option>
            <option value="1">Frank</option>
            <option value="3">Doug</option>
            <option value="5">Arnold</option>
        </select>

JavaScript

$("#Person1 [value]").prop('disabled',true);