Etienne opened the window and smelled the sweet, yeasty scent of the patisserie below his apartment. Pate sucree, macarons, pain au chocolat, the selections were more mouthwatering each day, but, as he had only a few francs to live on, he subsisted on his daily baguette with a few small clementines. When he visited his grand-mere in Chartres, she would prepare for him the foods of his childhood--boeuf bourguignon, coq au vin, and other hearty meals he remembered from years gone by. Day to day, however, his small meals contented him as he studied painting with the masters in Montmartre under the shadow of the Sacre Coeur. The words pate sucree, patisserie, macarons, grand-mere, and coq au vin are all examples of that will help you identify the culture of a literary piece?

A. geographic references
B. references to holidays and celebrations
C. unfamiliar words and phrases
D. references to culture and tradition