The Unpacking of Heterochromatin into Euchromatin Does Not Immediately Result

The unpacking of heterochromatin into euchromatin does not immediately result in DNA transcription because

A) Barr bodies are still present.
B) histones still block the binding of RNA polymerase to the promoter.
C) euchromatin is always transcriptionally inactive.
D) transcription factors still block the binding of RNA polymerase to the promoter.
E) heterochromatin contains DNA with accessible promoters. Even euchromatin is inaccessible unless the nucleosomes are moved to make the promoter accessible to RNA polymerase.