Espero aprender a tocar el piano con la Sra. Fernández
D because "Debajo" means under
I don't know which one is correct but I will translate
1- the woman is behind the computer
2-the woman is on top of the computer (definitely not this one)
3-the woman is far from the computer
4-the woman is in front of the computer
To me 1 and 4 makes more sense but you can choose
Most likely D since the noun árbol is masculine and you would use ese in that case.
