Periodization divides history into discrete, quantified named blocks of time in order to facilitate the study and analysis of history.
Number 1 is C!!! Do you need two also?
It can delay the time for medicine or the right treatment to get to "said" patient. Potentially being a life threatening situation/ Long term issue. Due to human error, the patient wouldn't improve and possibly get worse, and the doctor might not notice till next meeting.
(That's in general what I thought the answer could be. Also heh, you from health science class as well?)