Bacteria can become immune to antibiotics by directional selection. Choose the appropriate labels for A and B in the figure that depicts the evolution of a bacteria after being exposed to an antibiotic.

• A. A - Bacterial population B - Antibiotic-resistant bacteria
• B. A - Antibiotic-resistant bacteria, B - Bacterial population
• C. A - Dead bacteria, B - Bacterial population
• D. A - Dead bacteria, B - Antibiotic-resistant bacteria

Answer: (A)