How to remove “Select Option” from shop loop

Hello, I need help removing “Select Option” from Shop loop, and back only “Add to cart” functionality, i tried this

add_action('wp_loaded', 'remove_custom_woocommerce_filters', 20);

function remove_custom_woocommerce_filters() {

    if (class_exists('NM_PersonalizedProduct')) {

        remove_filter('woocommerce_product_add_to_cart_url', array('NM_PersonalizedProduct', 'loop_add_to_cart_url'), 10, 2);
        remove_filter('woocommerce_product_add_to_cart_text', array('NM_PersonalizedProduct', 'loop_add_to_cart_text'), 10, 2);
    }
}

but it doesn’t work