Bacteriophages Selectively Infect Bacterial Cells

Bacteriophages selectively infect bacterial cells. How might they be used as a therapeutic treatment in humans?

A) Phages can carry genes into cells which will genetically modify the host cells to prevent infection.
B) Phages can be used to stimulate human immune cells to attack and kill bacterial cells.
C) Bacteriophages can be used to genetically engineer bacterial cells making them more susceptible to drugs.
D) Humans suffering from infections with antibiotic resistant bacteria can be treated with phages, which will infect and lyse the bacterial cells, leaving human cells unaffected.