A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic of social oppression. It clearly states what social oppression is without needing other sentences for context. This follows the rule of Topic Sentence. Why other lines are not chosen? The other paragraphs are not chosen because they do not stand alone. For example, Paragraph 2 starts with "This kind of oppression" which needs context. Paragraph 3 uses "The outcome" which also needs prior information. Paragraph 4 starts with "Consequently" which shows it is not independent.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the ideas about social oppression. It shows the final outcome of the oppression discussed in the previous paragraphs. This follows the rule of Conclusive Words.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it gives more details about the type of oppression mentioned in Paragraph 1. This follows the Broader to Specific Strategy.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it explains what happens as a result of the oppression described in Paragraph 2. This follows the Cause and Effect Relationship.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it shows the benefits for the dominant group as a result of the sorting mentioned in Paragraph 3. This follows the Cause and Effect Relationship.