In the following question:
Which is more expensive_ the apple or the orange?
What punctuation should I use in place of the underscore?
I have thought of a few possibilities.
Which is more expensive? The apple or the orange?
When I read it without punctuation, I kinda raise my tone in both "expensive" and "orange", so I guess I should put question marks in both places?
Which is more expensive, the apple or the orange?
The two parts belong to a single question, so there should be a single question mark at the end?
Which is more expensive - the apple or the orange?
I faintly remember that I saw something like this in books. My memory could be wrong though.
Which should be used and why?