Answer:
Christopher's experience would be defined as Cultural Shock.
Step-by-step explanation:
Cultural Shock, as the name defines, is a state of shock for a person in a new culture. There are many phases in the cultural shock. When a person is introduced in a new culture, he is in the state of excitement in the beginning. This is called the Honeymoon phase in the cultural shock. After this, with the passage of time, realities of life take over the excitement and it begin to drop. The person feels irritated and finds it difficult to adjust in the new culture according to cultural shock. Same is the case with Christopher, he was excited at the start but then started to feel irritated. So he is experiencing the cultural shock.