Samuel, a training manager, notices that the staff's opinion about a certain issue has changed for some reason. He organizes a presentation

He first shows the staff all the benefits of the present idea and then he describes the visible threat and finally reemphasizes the worth and viability of the present idea. Which function of persuasive presentation did Samuel use?
a) Reinforc
b) Call to action
c) Refute
d) Promote change

A