It is customary for people in Japan to remove their shoes before entering a room in someone's house. When Dolly came back from Japan, she decided to adopt this custom. She now asks people who visit her to please remove their shoes before entering as a sign of respect and politeness. Using your knowledge of Greek and Latin roots, what is the meaning of the word customary in the passage above? A. a way of running B. the unknown C. commonly practiced, used, or observed D. foreign