Final answer:
The statement 'The nurse acted as if their own culture was superior to that of the patient's' exemplifies an ethnocentric attitude, as it conveys a belief in the superiority of one's own culture over others.
Step-by-step explanation:
The example of an ethnocentric attitude from the given options is: D. The nurse acted as if their own culture was superior to that of the patient's. This statement clearly reflects the belief that one's own culture is better than others, often leading to a lack of appreciation and a failure to understand the uniqueness and value of different cultures. It's important to differentiate between healthy cultural pride and the dismissive and harmful views that come with ethnocentrism.