A Treatment for Bacterial Infections from the Early 20th Century

A treatment for bacterial infections from the early 20th century has made a comeback; the use of bacterial viruses to eliminate bacterial infections.Which explanation most accurately describes the reason for the return of this treatment?

A) A wide variety of bacteria cause a large percentage of human infections, producing much sickness and death.
B) Viruses can infect bacteria, transferring pathogenic genes; the viral genes can then be suppressed, causing the bacteria to not replicate viruses.
C) The attachment structures on the virus and the receptors on the host cells make for exquisite specificity of viruses for particular bacterial species.
D) Antibiotic resistance in bacteria is on the increase, so using a different kind of therapy offers an alternative to traditional drugs.