The correct option is C Retrovirus
Retroviruses are the only animal viruses that are known to require the stable integration of their genetic information into the genomes of the host cells they infect. Hence it is commonly used as vector for introducing a DNA segments of interest in human lymphocytes.
Phage λ (lambda phage) is a bacterial virus, or bacteriophage, that infects the bacterial species Escherichia coli used to inject DNA into an E. coli cell.
The Ti plasmid can be used to carry foreign genes into plant cells.
pBR322 DNA is a commonly used plasmid cloning vector in E. coli.