What Is the Adaptation Hypothesis

What is the adaptation hypothesis?

A) The bacteria will mutate so it can become an auxotroph.
B) The phage mutates to infect bacteria more effectively.
C) The phage mutates so it can't infect bacteria any longer.
D) The phage and bacteria both mutate so the phage becomes less virulent.
E) The phage stimulates the bacteria to mutate to become immune to the phage.