Hello is it possible to disable "choose an option" in product page so that the client can only select one of the attributes?

Thanks!

Thank you but this is not the solution unfortunately. The user can still click the choose an option button.

Ok for anyone interested here is the code that solved the issue

add_filter( 'woocommerce_dropdown_variation_attribute_options_args', 'wc_remove_options_text');
function wc_remove_options_text( $args ){
    $args['show_option_none'] = false; //Instead of giving it a blank value, you return false
    return $args;
}