Which Statement About the Organ Identity Genes in Arabidopsis Thaliana

Which statement about the organ identity genes in Arabidopsis thaliana is true?

A) They stimulate production of the LEAFY gene.
B) They code for subunits of transcription factors.
C) The products of the genes are only active when three monomers make up a trimer.
D) A loss-of-function mutation in the LEAFY gene results in the formation of more flowers.
E) A loss-of-function mutation in a class A gene causes leaves to form instead of flowers.