Final answer:
DeMarco should not mention his cub scout leader in his speech for the full scholarship to Harvard Medical School as it would be least relevant when focusing on academic support for higher education. Typically, acknowledgments in such speeches are reserved for those who have directly supported the student's recent educational journey such as family members, professors, and tutors.
Step-by-step explanation:
Regarding who DeMarco should NOT mention in his speech for the full scholarship to Harvard Medical School, it seems that all the choices provided - a cub scout leader, a single-parent father, a biology professor, and an undergrad tutor - may have played some role in supporting his academic efforts. However, typically speeches for such academic achievements focus on people who have directly contributed to the student's educational journey in recent times. While a cub scout leader may have been influential during DeMarco's early development, their role is less directly related to his academic achievements compared to the support provided by family members, professors, and tutors. Therefore, it would be least relevant to mention the cub scout leader in the context of academic support for medical school.
It is vital for DeMarco to consider the audience and the nature of the event when deciding whom to acknowledge. Acknowledgments usually include those who have directly supported the academic or career path leading to the moment of receiving such an honor. Thus, mentioning his single-parent father, biology professor, and undergrad tutor would be most appropriate, as they have likely had a more immediate and relevant impact on his pursuit of medical education. However, every individual's life experiences are unique, and DeMarco should also consider any extraordinary contributions made by people like his cub scout leader that may warrant recognition in his speech.