What is Social
Hierarchy

First, inherent to the definition of a social hierarchy is the stratified ranking of group members along a valued dimension, with some members being superior or subordinate to others, and fewer members occupying the highest positions. It also refers to a society's categorization of its people into groups based on socioeconomic factors like wealth, income, race, education, ethnicity, gender, occupation, social status, or derived power.

Social stratification is the division of a society's population into groups based on socioeconomic variables such as wealth, income, race, education, ethnicity, gender, employment, social position, or derived power.

the correct answer is:   the domino theory states that if one country in a region came under the influence of communism, then the surrounding countries would follow in a domino effect.