Respuesta :
3- Ich bin Frau Sánchez.
Since you are using the formal form of you “Sie”, it indicated that you are referring to someone of authority, high power, elder, etc. You would address your teacher formally, so logically it would be 3.
Since you are using the formal form of you “Sie”, it indicated that you are referring to someone of authority, high power, elder, etc. You would address your teacher formally, so logically it would be 3.