A way to redirect users when they log in based on their current page

Use this:

if ( is_user_logged_in () ) {
    if ( is_page ( 'A' ) || is_page ( 'B' ) || is_page ( 'C' ) ) {   
        wp_safe_redirect( home_url() ); 
    }   
    // If we don't redirect, then will be in current page. No need to reload this page again. 
}