Answer: C) To educate.
Step-by-step explanation: when writing, an author can have different purposes, for example: to entertain, to inform, to persuade, to criticize, etc. From the given options, the one that represents the purpose of the class discussion, is the corresponding to option C: to educate, the class discussion was about genealogical research, and Cinta was about to share her information with her classmates and then answer questions.