"They are yours" was not accepted - since there is no context, surely that should be counted as correct too?
There's a mismatch in number. "They are yours" would be "Sono tuoi" or "Sono tue".
"Sono tue" is exactly what I heard. I think this is a poor sentence for a computer voice to read aloud. The difference is hard to make out, and is critical.
Can anyone tell me why it uses tua instead of tuo?