Which comparison would best support the idea presented in this paragraph?

through the process of phagocytosis, specialized cells in the immune system engulf and destroy unwanted microorganisms in the blood. this serves to remove foreign bodies and fight infection. these cells, called phagocytes, first surround the microorganisms and then begin a series of chemical reactions that break them down.
a. as if in a war, the phagocytes battle the microorganisms for control of the immune system.
b. much like the process of digestion, the phagocytes "eat" and then digest the unwanted organisms.
c. the phagocytes act as tour guides, showing microorganisms where they need to reside.
d. acting like a cargo transport, the phagocytes move the unwanted organisms out of the body.