In Nature, Poinsettias Bloom in Early March

In nature, poinsettias bloom in early March. Research has shown that the flowering process is triggered 3 months before blooming occurs. In order to make poinsettias bloom in December, florists change the length of the light-dark cycle in September. Given this information and clues, which of the following is a correct statement about poinsettias?

A) They are short-day plants.
B) They require a light period longer than some set minimum.
C) They require a shorter dark period than is available in September.
D) The dark period can be interrupted without affecting flowering.
E) They will flower even if there are brief periods of far-red illumination during the nighttime.