Answer: D) Chopin uses a simile to compare how quickly the Aubigynys fall in love to a pistol shot.
Explanation: A simile is a figure of speech that consists in making a comparison between elements that aren't obviously related, this comparison is made using the words "like" and "as." In the given excerpt, Kate Chopin uses a simile to compare how quickly the Aubigynys fall in love to a pistol shot, in the phrase "That was the way all the Aubignys fell in love, as if struck by a pistol shot."