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="enable" 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="enable" onclick="check();" value="4"> chbx4

CSS

* {margin: 0px; padding: 0px;}
body {background-color: rgb(248,248,248)}
#nav {
    list-style:none;
}
#nav li {
    float:left;
    display:block;
    width:100px;
    position:relative;
    z-index:500;
}
/* this is the parent menu */
 #nav li a {
    display:block;
    padding:15px;
    color:#000;
    border: 1px solid transparent;
}
#nav li a:hover {
    border: 1px solid black;
    
}
 #nav a.open {
    color:#fff;
    background-color: pink;
}
 #nav ul {
    position:absolute;
    display:none;
    padding:0;
    list-style:none;
}
#nav ul li {
    width:100px;
    float:left;
}
 #nav ul a {
    display:block;
    height:15px;
    padding: 15px;
    color:#666;
}
#nav ul a:hover {
    text-decoration:underline;
}
.active{
    background-color: pink;
    
}

JavaScript

$(".dissable").attr("disabled", "disabled");
$("#Units").on("change", function() {
    if ($(this).val() !== "Finance") {
    
    $(".dissable").attr("disabled", "disabled");
} else {
    $(".dissable").removeAttr("disabled");
}
});