The correct option is B In the cytoplasm.
The ribosomes are the cellular organelles which are associated with the protein synthesis. The bacteria are the prokaryotic organisms which do not have cellular organelles. The ribosomes are not associated with endoplasmic reticulum in the bacteria and are dispersed in the cytoplasm. There are 70S ribosomes in the bacterial cytoplasm which translate the mRNA to protein. Thus, the correct answer is option A.