The following events may occur when an antibiotic is used to treat a bacterial infection. 1 Most of the bacteria are killed by the antibiotic. 2 The antibiotic-resistant bacteria multiply. 3 The antibiotic-resistant bacteria remain alive. 4 Some bacteria mutate, so they are resistant to the antibiotic. Which sequence could lead to a strain of antibiotic-resistant bacteria?
- A1 2 2 3 2 4
- B2 2 3 2 1 2 4
- C3 2 1 2 4 2 2
- D4 2 1 2 3 2 2