JSFiddle - React, Tailwind, and code Playground

HTML

<select id="sel1">
  <option value="">1지망</option>
  <option value="a">a</option>
  <option value="b">b</option>
  <option value="c">c</option>
  <option value="d">d</option>
</select>

<select id="sel2">
  <option value="">1지망</option>
  <option value="a">a</option>
  <option value="b">b</option>
  <option value="c">c</option>
  <option value="d">d</option>
</select>

JavaScript

$(function() {
  $('#sel1').on('change', function() {
    var selected_val = $(this).val();
    $("#sel2 option[value='" + selected_val + "']").remove();
  });
});