Olek js

let BMW_modele = ['1M', '3GT', 'i8', 'iX2', 'Seria 5', 'X7']
let Mercedes_lista = ['AMG GT', 'Citan', 'CLA', 'CLE', 'EQA', 'EQB', 'EQC', 'EQE']
var modeleAudi = ['A1', 'A2', 'A3', 'A4', 'A5', 'A6', 'e-tron']
var modeleToyota = ['Yaris', 'Yaris Cross','Corolla TS Kombi','Corolla Sedan','C-HR','C-HR Plug-in Hybrid','bZ4X','Prius']
var modeleHonda = ['Jazz', 'Civic', 'HR-V', 'Accord', 'Prelude', 'CRX']
var moOpel = ["Corsa", 'Astra', 'Insignia', "Grandlan X"]
let nice = document.getElementById("gotowe")
let BMW_l = document.getElementById("BMW")
let modele = document.getElementById("modele")
let opel = document.getElementById("Opel")
let Toyota = document.getElementById("Toyota")
let Mercedes = document.getElementById("Mercedes")
let Honda = document.getElementById("Honda")
let Audi = document.getElementById("Audi")
let r = document.getElementById("r")
BMW_l.onclick = function() {

    modele.innerHTML = ''

    BMW_modele.forEach(function(optionText) {
        let option = document.createElement('option');
        option.text = optionText
        modele.appendChild(option);
    });
}
opel.onclick = function() {

    modele.innerHTML = ''

    moOpel.forEach(function(optionText) {
        let option = document.createElement('option');
        option.text = optionText
        modele.appendChild(option);
    });
}

Toyota.onclick = function() {

    modele.innerHTML = ''

    modeleToyota.forEach(function(optionText) {
        let option = document.createElement('option');
        option.text = optionText
        modele.appendChild(option);
    });
}
Mercedes.onclick = function() {

    modele.innerHTML = ''

    Mercedes_lista.forEach(function(optionText) {
        let option = document.createElement('option');
        option.text = optionText
        modele.appendChild(option);
    });
}
Honda.onclick = function() {

    modele.innerHTML = ''

    modeleHonda.forEach(function(optionText) {
        let option = document.createElement('option');
        option.text = optionText
        modele.appendChild(option);
    });
}
Audi.onclick = function() {

    modele.innerHTML = ''

    modeleAudi.forEach(function(optionText) {
        let option = document.createElement('option');
        option.text = optionText
        modele.appendChild(option);
    });
}
r.onclick = function() {
    modele.innerHTML = ''
}