Answer:
D) Culture shock
Step-by-step explanation:
you can think of it as jack actually being shocked by everything he's seeing in japan. as an american, jack is used to the way things are in america, so to relocate to japan for his assignment, he's now seeing the way things are in Japan, NOT america. in japan, there's different food, language, and cultural norms, and it's no surprise it has to take jack a few months to get used to everything.