If a bacteria were susceptible to both penicillin and Erythromycin, then it would not be appropriate to treat the patients with both antibiotics at the same time because
A
Penicillin is inactivated by erythromycin
B
Erythromycin exerts its effects extracellularly
C
Erythromycin enhances the β-lactamases activity
D
Penicillin is only effective against growing cells