In a Study of Arabidopsis Thaliana Researchers Determined That, with Respect

In a study of Arabidopsis thaliana researchers determined that, with respect to the protein product responsible for triggering flowering:

A) transcription did not follow a circadian pattern.
B) transcription was high and in sync with the light period when day lengths were long.
C) the protein accumulated only in the dark.
D) the proteins are stabilized by dark periods when day lengths are short.
E) photoreceptors show no indication of stabilizing the protein.