¿Qué horário tienes?

¿Qué horario tienes?
 

The answers are: 1) Son las cinco y media 2) Lo siento, no tengo tiempo 3) De 9 a 2 y de 3 a 6 4) Ocho
- Does this also means "what time is it?"
- Can you also just say "Ocho" instead of "son las ocho"?

I don't know if this is a regional use of the word "horario" (no accent), but this question is asking about a schedule, not the hour. My answer here would be 3).
In colloquial speech though, people may ask "¿Qué hora tienes?"

And no, you can't say "ocho". Even in a context when someone is asking you what time it is, "ocho" wouldn't be enough to say the hour. We need something that indicates that we are talking about the clock. The short form of "son las ocho", is "las ocho". However you can say "ocho y media" instead of "son las ocho y media", because "y media" indicates the hour, in the right context.

Sorry, another typo, it should be horario instead of horário, thanks for letting me know.

I should have checked meaning of "horario" before posting, hora is time and horario is schedule. Thanks

Interesting, you learn something every day.