The correct option is
B Prokaryotic and unicellular
Mycoplasma is the smallest bacteria which does not possess a cell wall. It is a prokaryote organism. They are composed of a single cell and are non-motile. The cell contains the cell membrane, proteins, DNA and ribosomes. The absence of a cell wall renders the organism as insensitive to most of the antibiotics.
Thus, the correct answer is 'Prokaryotic and unicellular'.