You Add an Unknown Phage to a Mixture of F⁺

You add an unknown phage to a mixture of F⁺ and F^- cells of

A) The phage bound to a receptor on the sex pilus,and therefore only infected the F⁺ cells (leaving the F^- cells alone) .
B) The phage bound to a receptor on the F^- cells,leaving only them alive and allowing the F⁺ cells to die off.
C) The phage integrated (lysogenized) the F^- cells,giving them a selective advantage over the F⁺ cells.
D) F⁺ cells are uniquely susceptible to phage attack for unknown reasons.
E) coli and plate out the bacteria.The bacterial colonies that grow are all F^-.How can you explain this phenomenon?