In which situation would you most likely use the usted form?
Answer : B.) con profesores.
Explanation : The second formal person in Spanish is "usted", what is said to show respect to the person you are speaking. Therefore is used with older people, teachers, police, etc.
La población demanda políticas públicas que regulen las prácticas de reciclaje y apuntan contra las marcas como responsables de la gestión de los residuos.