The problem lies in properly removing listeners from selectors in classes. When adding a listener, some arguments are passed to the function.
I tried to use .bind(this), but I don’t understand how it should work with functions that have arguments.
export default class Quiz {
    constructor() {
        this.selectElement = this.selectElement.bind(this);
        this.eventHandlers();
    }
    eventHandlers = () => {
        const listItem = document.querySelectorAll('.answer-menu__item');
    
        listItem.forEach((e, i) => {
            e.addEventListener('click', (elem) => this.selectElement(elem, i));
        });
    }
    selectElement = (element, index) => {
        // Doesn’t work.
        p.currentTarget.removeEventListener('click', this.selectElement);
    }
}
 
    