The most important mechanism by which gram negative bacilli acquire chloramphenicol resistance is:: (A) Decreased permeability into the bacterial cell., (B) Acquisition of a plasmid encoded for chloramphenicol  acetyl transferase., (C) Lowered affinity of the bacterial ribosome for chloramphenicol., (D) Switching over from ribosomal to mitochondrial protein synthesis.
Answer is B. None