Which of the Following Describes the Role of Acetylation During

Which of the following describes the role of acetylation during the chromatin remodelling that accompanies gene expression?

A) It adds an acetyl group (CH₃CH₂-) to the DNA of a promoter sequence.
B) It adds an acetyl group (CH₃CO-) to the histone protecting the promoter region of a gene.
C) It adds an acetyl group (CH₃CO-) to the cytosine nucleotides of DNA.
D) It adds an acetyl group (CH₃CO-) to the histone protecting the transcription unit of a gene.