A short-day plant exposed to nights longer than the minimum for ...

[xclash]

A short-day plant exposed to nights longer than the minimum for flowering but interrupted by short flashes of light
A) never flower.
B) might flower depending upon the duration of the light flash.
C) will not be affected and will flower.
D) might flower depending upon the wavelengths of the light flashes.
E) will still flower if ethylene is administered.

[clippers!]

I chose D and got the answer, hope that helps.