A randomized,double-blinded trial finds that oral corticosteroids are superior to placebo in hastening the resolution of otitis media with effusion.Possible reasons why this study,might have given a falsely positive result include:

• A. The apparent effect might be a result of chance
• B. Lax inclusion criteria may have led to inclusion of some subjects in the study who did not really have otitis media with effusion
• C. The sample size may have been too small
• D. None of the above