How can species of bacteria evolve to be resistant to antibiotics?

I. A variation within one bacterium’s genome confers resistance. 
II. Antibiotics enable genes to become adapted through transcription and translation. 
III. An incomplete dose of antibiotics allows bacteria with a high resistance to survive and reproduce.

A. I only
B. I and II only
C. I and III only
D. III only
 

C

The wording of this question could have been clearer.