One Benefit of Operons in Bacteria Is That They

One benefit of operons in bacteria is that they

A) allow for alterations in DNA sequence by flipping promoters around.
B) allow for coordinated gene expression of related genes on one mRNA controlled by one promoter.
C) do not need ligands and regulatory proteins as single genes would.
D) do not need any modification of the proteins after they are expressed.
E) allow for the bacteria to utilize a wide variety of carbon sources.