Answer:
D. Personification
Step-by-step explanation:
A rhetorical device refers to the use of words in certain way in order to convey meaning or persuade the reader or audience, to evoke their emotions.
Personification refers to a type of rhetorical device or a figure of speech that gives human attributes to a thing or non-human object such as an animal, an idea or event. Personification portrays that thing in way that make people to think they can do what human do.
For example, "Let history be the final judge of our deeds" in the question is a personification. This is because is "history" is an event and not a human being, but it is given an attribute, a role or a title of human being, i.e. judge, a human.
Therefore, the rhetorical device used in "Let history be the final judge of our deeds" is personification.