The correct option is A Bacteriophages
A bacteriophage is a type of virus that infects bacteria. All bacteriophages are composed of a nucleic acid molecule that is surrounded by a protein structure. A bacteriophage attaches itself to a susceptible bacterium and infects the host cell. After the infection, the bacteriophage hijacks the bacteria cellular machinery to produce viral components. Eventually, new bacteriophages assemble and burst out of the bacterium in a process called lysis. So, the correct answer is 'Bacteriophages'.