Final answer:
Option (c), Exhibiting overconfidence does not represent a professional phlebotomist because it can lead to mistakes, while other options represent positive professional behaviors.
Step-by-step explanation:
Among the behaviors listed, exhibiting overconfidence does not represent a professional phlebotomist. A professional phlebotomist should always maintain a level of humility and continually seek to improve their skills and knowledge.
Overconfidence can lead to mistakes and oversight, compromising patient care and laboratory results. This is contrary to attending continuing education programs, organizing requisitions, and volunteering for extra duties, all of which are indicative of a proactive and engaged professional.