HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery selected selector demo</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    div { color: red; margin-top: 12px; font-weight: bold; }
  </style>
</head>
<body>
  <select>
    <option>Flowers</option>
    <option>Shrubs</option>
    <option selected>Trees</option>
    <option>Bushes</option>
    <option>Grass</option>
    <option>Dirt</option>
  </select>
  <div id="out"></div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("select")
      .on("change", function() {
        var str = "";
        $("select option:selected").each(function() {
          str += $(this).text() + " ";
        });
        $("#out").text(str);
      })
      .trigger("change");
  </script>
</body>
</html>

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jQuery option:selected — official change demo (Try It)