Based on the information and diagram, which antibiotic would be most effective to use in treating the patient?

Exhibit:

Based on the information and diagram, which antibiotic would be most effective to use in treating the patient?
A . the antibiotic in section D
B . the antibiotic in section A
C . the antibiotic in section B
D . the antibiotic in section C
E . The antibiotics in sections A and C are equally effective.

Answer: B