Load database data into input after selecting id in dropdown

I have the following problem: I have a dropdown (which has as values the id's of a table of my bank) and I would like, after making the selection of one of the items of this, data related to it (present in the bank) , fill in the input values on the same page. Could someone help me?

    <div class="modal fade" id="modalEventoEdit" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
        <div class="modal-dialog" role="document">
            <div class="modal-content">
                <div class="modal-header">
                    <h5 class="modal-title"> <i class="fas fa-pen"></i> Editar evento</h5>
                    <button class="close" type="button" data-dismiss="modal" aria-label="Close">
                        <span aria-hidden="true">×</span>
                    </button>
                </div>
                <form method="POST" action="cadasevento.php">
                    <div class="modal-body">
                        <?php 
                            $id_adm = $_SESSION['id_adm'];
                            $sql = "SELECT * FROM tb_evento WHERE id_adm = $id_adm ORDER BY data_inicio";
                            $r_evento = $con->query($sql);
                        ?>
                        <select name="c" class="form-control" id="c">
                            <option>Escolha o evento</option>   
                            <?php
                                while($row_evento = $r_evento->fetch_assoc()){
                            ?>
                            <option value="<?php echo $row_evento['id'];?>">
                            <?php 
                            echo $row_evento['titulo'];
                            ?></option>
                            <?php 
                                }
                            ?>
                        </select>
                    </div>
                    <div class="modal-footer">
                       <button class="btn btn-outline-success" type="submit">Enviar</button>
                    </div>
                </form>
            </div>
        </div>
    </div>

Everything must occur within this modal, where after selecting the option input fields are filled with the selection data.