All of the Following Are Examples of Post- Transcriptional Regulation

All of the following are examples of post- transcriptional regulation except

A) cells can regulate how mRNA is spliced and exported out of the nucleus before translation occurs.
B) in prokaryotic cells, small noncoding RNAs that work in post- transcriptional regulation include small RNAs.
C) cells can regulate translation by methylating certain DNA nucleotides.
D) cells can regulate translation by affecting how readily ribosomes associate with mRNA to read it.
E) in eukaryotic cells, small noncoding RNAs that work in post- transcriptional regulation include microRNAs and short interfering RNAs.