Answer:
Charlie y Sophie van a Argentina.
Soy mama de maria. maria es la hermana de ana. no soy la mama de ana. ana es la hermana de maria
B. Fueron
Fui is speaking in terms to yourself
Fueron is the best choice because you are talking about what your grandparents did or were they went, in this case you can almost assume the grandparents were doctors there for B. Is the appropriate response.