It is a. principle because the question is asking about the commutative\
Under is the prepositional phrase. Remember prepositional phrases show location. Under ins the only word that does that. Good luck my man.
Character motivation affect a story's plot by doing the act and being consistent about it. Characters in action is what makes plot, and motivation creates action and individualizes character. By doing so, it creates a more powerful story. This affects the trajectory of the plot and will deliver the rightful message to the audience.