I think you need to fix some stuff there
Ésta es mío.
The sentence <u>"This is mine"</u> is <u>incorrect,</u> since it is very confusing when pronouncing it, we could say that it does not make sense.
We change some words, so that the sentence is correct:
It's all we do.
The sentence is Spanish we have: "Esto es mío".
If the sentence were this way, the answer would be correct, but since it is not, it is incorrect.
