Explanation:

- Open Stratification

- This system allows for social mobility.

- Individuals can move up or down the social hierarchy based on their achievements.

- Societies with open stratification often experience higher competition due to opportunities for upward mobility.

- Correct Answer

- Close Stratification

- This system restricts social mobility.

- Individuals are often born into their social position.

- Competition is less pronounced as roles and statuses are predefined.

- Barter Exchange

- Involves trading goods and services without money.

- More related to economic systems than social stratification.

- Raid Stratification

- Not a commonly recognized term in social sciences.

- Potentially implies hierarchical division based on warfare or raids.