White people in the United States tend to assume that before white Europeans came to North America it was undiscovered, a view that ignores the presence of native Americans for many centuries before. This tendency to believe that our own culture is the only one of importance and that others should be judged by our standards is called

a. Cultural integration.
b. Cultural diffusion
c. Ethnocentrism.
d. Cultural relativity

c. Ethnocentrism.

Explanation:

Ethnocentrism is a perception that your one's own culture or ethnicity is superior to another. This comes from using your own cultural ideals to define other cultures. Ethnocentrism is based on the notion of blind spots in society. Blind spots arise when we fail to explain variations in cultural schemas between our attitudes and values and those of others.

the answer to your question is,

d. when a child was born.

-mabel < 3