Answer: I would contend that the right answer is the B) Details that imitate real life provide the imagery.
Explanation: In this excerpt, Kate Chopin is presenting reality in a plausible and objective way, using a clear language, and paying attention to detail. She is describing an immediate action, specifically a procession that is taking place presently, and she is focusing primarily on the characters that are participating in it - two lovers, a lady, old Monsieur Farival, and a young Spanish girl. These are characteristics of realism. Realism does not exaggerate real life, and characters, and their actions and particularly their feelings and their relationships, play an important role, so options C and D should be discarded.