Why Aren't Antibiotics Necessarily the Solution to Pathogen Infections

Why aren't antibiotics necessarily the solution to pathogen infections?

A) There aren't antibiotics that can kill every pathogen.
B) Pathogens can become resistant to antibiotics over time.
C) If you kill off an infection with antibiotics rather than allowing an immune system to do it, there will be no memory cells to prevent future infections.
D) Not everyone can take antibiotics.
E) All of the above