3.Locked profile

function solve() {
    let profilesArr = Array.from(document.getElementsByClassName('profile'));

    for (let profile of profilesArr) {
        let btn = profile.querySelector('button');
        btn.addEventListener('click', showMore);
    }

    function showMore (event) {
        let button = event.currentTarget;
        let currentProfile = event.currentTarget.parentElement;
        let currentProfileHidden = currentProfile.querySelector('div:last-of-type');
        let currentProfileLock = currentProfile.querySelector('.radio-group input[type="radio"]:first-of-type');
        let isLocked = currentProfileLock.checked;

        if (button.textContent === 'Show more') {

            if(!isLocked) {
                button.textContent = 'Show less';
                currentProfileHidden.classList.remove('active');
            }
        } else {
            button.textContent = 'Show more';
            currentProfileHidden.classList.add('active');
        }
    }
}