The assumption that our way of thinking and acting is naturally superior to others resulting in the use of ourselves or our culture as a yardstick by which we measure what is right or desirable or normal
a. ethnocentrism
b. stereotype
c. prejudice
d. discriminationv

Option (A) is correct.

Explanation:

Ethnocentrism is the known as or referred as the act of judging someone's culture in regards to the preconceptions or pre-conceived notion which are found mostly in the standards and values of an individual's own culture, specially in regards to their behavior, language, religion and custom. These categories or aspects are recognized as distinctions that tend to define cultural identity of each ethnicity.

loess contribute to the flooding of rivers by providing the silt that is washed into rivers and constantly raises the bed of the rivers. this elevation above the surrounding flood plains and dams allow the river to overwhelm the dams and flood thousand of square miles of neighboring flood plains.

i think the answer is true : ))