JSFiddle - React, Tailwind, and code Playground

HTML

<select id="Units">
    <option value="Marketing" > Marketing </option>
    <option value="Finance" > Finance </option>
    <option value="Operations" > Operations </option>
</select>

<input type="checkbox" class="dissable" onclick="check();" value="1" /> chbx1
<input type="checkbox" class="dissable" onclick="check();" value="2" /> chbx2
<input type="checkbox" class="dissable" onclick="check();" value="3" /> chbx3
<input type="checkbox" class="dissable" onclick="check();" value="4" /> chbx4

JavaScript

$("#Units").on("change", function () {
    if ($(this).val() !== "Finance") {
        $(".dissable[value='3']").prop("disabled", true); 
        $(".dissable[value='4']").prop("disabled", true); 
    } else {
        $(".dissable[value='3']").prop("disabled", false);
        $(".dissable[value='4']").prop("disabled", false);
    }
}).trigger('change');