Escoge el mandato formal escrito correctamente. no juegues en la calle. regresa temprano. no tire basura en el parque.

No tire basura en el parque.

Explanation:

The formal style of writting in spanish is when you talk to people in "Usted" form and that is accomplished by speaking in third person to the person, you never speak in second person to someone that you are approaching formally.

So the only one from the options that is not speaking directly in "You" form rather and a "He/she" form or third person form is "No tire basura en la calle", so that would be the formal command written properly.

1.) la ruta arqueologica

2.) la ruta artesanal

3.) la ruta paraiso artesanal  

4.) la ruta de las flores

5.) la ruta sol y playa

6.) la ruta de la paz