The diagram illustrates one method for investigating how an antibiotic affects bacteria. Areas measuring less than $13.0\,\text{mm}$ indicate that resistant bacteria are present. Which statement can be justified by these data?
- AAll the types of bacteria become resistant to antibiotics over time.
- BOnly types 2, 3 and 4 of the bacteria show resistance to the antibiotic.
- CThe antibiotic can be used to treat types 1 and 3 only.
- DType 5 of the bacteria can never become resistant to the antibiotic.