In formal writing (like a technical paper), is there a generally accepted way to punctuate the break between an introductory phrase and a question in a sentence like this?
Let's ask ourselves (--insert punctuation here--) what would a world without computers look like?
I know that you could reword it to avoid the direct question, but that's not what I'm asking about.
A few possibilities occurred to me:
Let's ask ourselves: what would a world without computers look like?
Let's ask ourselves - what would a world without computers look like?
Let's ask ourselves... what would a world without computers look like?
Let's ask ourselves, what would a world without computers look like?
Let's ask ourselves, "What would a world without computers look like?"
Which would be the best to use and why?