xdf讲义加强题

the traditional treatment of step infections has been a seven--day course of antibiotics, either penicillin or erythromycin. however, since many patient stop taking those drugs in three days, reinfection is common in cases where these drugs are prescribed. a new antibiotic requires only a three--day course of treatment. therefore, reinfection will probably be less connon in cases where the new antibiotic is prescribed than in cases where either penicillin or erythromycin is prescribed.

which of the following, if true, most strengthen the argument?

A some of people who are allergic to penicillin are likely to be allergic to the new antibiotoc.

B a course of treatment with the mew antibiotic cost about the same as a course of treatment with either penicillin or erythromycin.

C the new antibiotic has been shown to be effective in eradicating bacterial infection other than strep.

D some physicians have already begun to prescribe the new antibiotic instead of penincillin or erythromycin for the treatment of some strep infections.

E regardless of whether they take a traditional antibiotic or the new one, most patients feel fully recovered after taking the drugs for three days.

the answer is E. would you tell me the reason? thank you!!!