The answer would be A.
Casa is house/home and it makes the most sense in this sentence :)
Have a good day!
It would be "Sé Bueno" if thats what your looking for
Eres bueno = you are good
ser bueno = to be good
seas bueno , I really don't know but I it's not the answer
Answer:
El Renacimiento es importante porque condujo a un cambio importante en el pensamiento europeo y la cosmovisión
Explanation: