Answer:
A) Culture shock
Step-by-step explanation:
This is a clear example of what A) culture shock is: When someone is on a trip far from his homeland he experiences other cultures which have differents approaches to life (such as the kiss, or other´s like religion, food, dancing, clothing, sports etc.). When one encounters such different approaches there´s always a chance of being shoked by them (like our friend Rodney).
The answer clearly is not B) imperialism beacuse Rodney does not have any political or military attitude towards the italians. Neither is C) ethnocentrism because Rodney is not making a judgement towards the italian salute, he was simply suprised. And is not D) xenocentrism because Rodney is not prefering the Italian way of saluting over the american way.