Which of the Following Statements About Histones and Gene Expression

Which of the following statements about histones and gene expression is CORRECT?

A) In a general sense, highly condensed DNA bound with histone proteins represses gene expression.
B) Acetylation involves the addition of acetyl groups to histone proteins, and it usually results in repression of transcription.
C) Addition of methyl groups to the tails of histone proteins always results in activation of transcription.
D) Histone code refers to the modification that takes place on the globular domain of the octamer histone core.
E) Phosphorylation of cytosines generally leads to increase in transcription..