There is a movie documenting Richard Bach's late-70's barnstorming trip
around the country with a pair of Fleet biplanes (same name as the book,
but I cannot remember what the title is). In one segment, he attaches
flares to the wingtips and goes flying, ignites the flares and in the
course of the flight, stalls and spins the aircraft. It is at this point
the a picture makes clear what is happening with the wings.
The smoke from the flare on the outside (flying) wing streams behind the
wingtip, while the smoke from the flare on the inside (stalled) wing
wafts slowly upward. This was filmed from the air from the accompanying
aircraft.

Chris G. wrote:
And I would read that as "both wings are stalled"... It's a very poorly
written question or very well written (depending on your point-of-view).
I consider it poorly written because the answer is not clear in the
training materials AND not clear on the exam.