The correct option is D Ribosomes
Bacteria belong to group Monera. Organisms belonging to group Monera are primitive, unicellular and prokaryotes. They do not possess many membrane bound organelles such as mitochondria, Golgi apparatus, etc. They also do not have well defined membrane bound nucleus. They possess protein synthesis machinery, i.e., ribosomes. Ribosomes are non-membranous. Bacterial ribosome is of 70s type.