JSFiddle - React, Tailwind, and code Playground

HTML

<script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select class="form-control SelectPriority" autocomplete="off" id="FirstPriority">
        <option value="0" disabled selected value>Please choose one.</option>
        <option value="1">1</option>
        <option value="2">2</option>
        <option value="3">3</option>
        <option value="4">4</option>
        <option value="5">5</option>
        <option value="6">6</option>
        <option value="7">7</option>
    </select>

    <select class="form-control SelectPriority" autocomplete="off" id="SecondPriority">
        <option value="0" disabled selected value>Please choose one.</option>
        <option value="1">1</option>
        <option value="2">2</option>
        <option value="3">3</option>
        <option value="4">4</option>
        <option value="5">5</option>
        <option value="6">6</option>
        <option value="7">7</option>
    </select>

    <select class="form-control SelectPriority" autocomplete="off" id="ThirdPriority">
        <option value="0" disabled selected value>Please choose one.</option>
        <option value="1">1</option>
        <option value="2">2</option>
        <option value="3">3</option>
        <option value="4">4</option>
        <option value="5">5</option>
        <option value="6">6</option>
        <option value="7">7</option>
    </select>

    <select class="form-control SelectPriority" autocomplete="off" id="ForthPriority">
        <option value="0" disabled selected value>Please choose one.</option>
        <option value="1">1</option>
        <option value="2">2</option>
        <option value="3">3</option>
        <option value="4">4</option>
        <option value="5">5</option>
        <option value="6">6</option>
        <option value="7">7</option>
    </select>

    <select class="form-control SelectPriority" autocomplete="off" id="FifthPriority">
        <option value="0" disabled selected value>Please choose...

JavaScript

$(document).ready(function() {
  $('.SelectPriority').change(function () {
		$('.SelectPriority').each(function() {
      $(this).siblings().find('[value=' + $(this).val() + ']').prop('disabled', true);
    });
  });
});