A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic of the text, which is the French Revolution. It gives a broad overview of the event without going into details. 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 'Sparked by social and economic inequality,' which needs more context. Paragraph 3 starts with 'Consequently,' which shows it is linked to something before it. Paragraph 4 starts with 'Hence,' which also shows it is a conclusion. All these words show they are not independent sentences.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the main ideas of the text. It summarizes the importance of the French Revolution and its ideals. This follows the Summary Style rule.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it explains why the French Revolution happened. The word 'sparked' shows a cause for the event mentioned in Paragraph 1. This follows the Cause and Effect Relationship rule.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it shows the result of the events in Paragraph 2. The word 'consequently' shows that what happened next was because of the previous paragraph. This follows the Cause and Effect Relationship rule.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it summarizes the importance of the French Revolution. The word 'hence' shows that it is concluding the ideas from the previous paragraph. This follows the Conclusive Words rule.