All of the Following Are Epigenetic Mechanisms,EXCEPT ________

All of the following are epigenetic mechanisms,EXCEPT ________ .

A) changing gene expression by changing the nucleotide sequence through mutation
B) changing gene expression by adding and removing chemical groups to histone proteins
C) changing gene expression by the use of long noncoding RNAs
D) changing gene expression by the use of small noncoding RNAs
E) changing gene expression by adding and removing methyl groups to DNA