Cómo es ella? because you need the same verb as the answer (between ser and estar) and cómo means how. The answer is about how the girl is, so it is the right question
De d<span>ónde means where so it wouldn't be good.
Also C</span><span>ómo se llama? means what's her name which is not given in the answer.</span>
The Correct answer is “que”
Could you add the entire excercise? I can't really understand it. Thanks!
A que hora empiezas el día
At what time do you start your day
