How would you say that a student is standing in front of the door?

a.
un estudiante es encima de la puerta.

b.
un estudiante es delante de la puerta.

c.
un estudiante está encima de la puerta.

d.
un estudiante está delante de la puerta.

I'm antonio. i'm 15 years old. in my country there is a law that reminds me that < < there is a law that reminds me that > > i have to sweep and clean the house every week. i have to study every day. my friend laura is 12 years old; she has to wash dishes after dinner on tuesdays and thursdays, and she has to scrub the floor every < < each > > week. she goes to school with me < < with me > > . based on what you learned from the lesson , which country are antonio and laura describing? argentina brazil spain uses