You don't have my answer listed, and it's actually a trap question which should not even be asked during the initial interview.
If pinned into a corner about it, it's best to have been informed beforehand on what is the average pay rate for that career field in your area - as well as cost-of-living and such taken into account. There's a huge difference in pay between - say - the exact same bakery job in New York ($25/hr) and Florida ($9/hr). Giving too high of a figure will get you booted out, and giving too low of a figure will get you taken advantage of. Go for an upper middle number, which can be negotiated with. Of course there is always what my response to the poll would be:
"What is the range you are willing to offer?"