In many Asian, Middle Eastern, and some European households, what is a common etiquette rule when entering someone's home?
A) Always bring a hostess gift, regardless of the occasion.
B) Keep your shoes on to show respect for the cleanliness of the floor.
C) Remove your shoes at the entrance.
D) Offer to help with household chores immediately upon arrival.
E) Greet everyone with a hug and a kiss.