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 contract theory. It gives a broad overview of what the text will discuss. It does not use any specific details or references to other ideas, which makes it a good starting point. Why other lines are not chosen? Paragraph 2 starts with "It proposes" which makes it dependent on prior context. Paragraph 3 starts with "Thinkers like" which also needs context. Paragraph 4 starts with "Hobbes saw" which refers to a specific thinker and idea. Paragraph 5 starts with "In contrast" which shows a comparison and needs prior information.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the discussion by presenting Rousseau's view. It contrasts with Hobbes' view and brings closure to the topic of different interpretations of the social contract.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it explains what social contract theory proposes. This follows the Broader to Specific Strategy, where the first paragraph gives a general idea and the second paragraph provides specific details about that idea.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it introduces different thinkers who interpret the social contract. This follows the Logical Order rule, as it moves from a general idea about consent to specific examples of thinkers.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it gives a specific view from Hobbes about the social contract. This follows the Object Subject Strategy, where the subject of the previous paragraph (thinkers) becomes the focus in the next paragraph.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects to Paragraph 4 because it presents a contrasting view from Rousseau about the social contract. This follows the Contrast rule, as it shows a different interpretation from the previous paragraph.