All are natural. 'Home' can be omitted if it is clear from the prior context. You can also say 'when' instead of 'what time'.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
seagullwhat would a native speaker say in a situation like this?I'd say (a), but I'd probably assume "home" and omit it.