The correct option is C Temperate phages
Temperate phages are some bacteriophages which display a lysogenic life cycle. Lysogeny is characterized by an integration of the bacteriophage nucleic acid into the host bacteria genome and becomes prophage. In this condition, the bacterium continues to live and reproduce normally. Bacteriophages that only use the lytic cycle are called virulent phages. So, the correct answer is 'temperate phages'.