Answer:
b. third person.
Step-by-step explanation:
A formal academic essay should avoid using a personal language because it would take the formal tone of the essay. Based on this, we can conclude that the letter A and D are incorrect because both convey a sense of intimacy with the reader and this removes the formal tone of the essay. The letter c can also be considered incorrect because the word "subjective" means something that is characteristic of an individual; individual, personal, private; that is, this also removes the formal tone of the essay. So the correct answer is the letter B, since the third person point of view establishes a formal and impersonal tone in the essay.