she dreamed of ........ future where she could have her on flat

[abo.omar]

she dreamed of ........ future where she could have her own flat
-a
- the
-no article
1-My answer is a.
2-Is the is correct too?
3- Is where correct in such a context or when is better?

 

[probus]

1-My answer is a.

I agree.


2-Is the is correct too?

Gramatically correct but unnatural and slightly different in meaning.

3- Is where correct in such a context or when is better?

I prefer "in which" but native speakers sometimes use "where". In my opinion "when" is unnatural in this context.