A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic of character analysis. It gives a clear overview of what a character analysis is about. This follows the rule of Topic Sentence. It does not refer to any previous information, so it stands alone. Why other lines are not chosen? The other paragraphs are not chosen because they do not meet the criteria for being independent. For example, Paragraph 2 starts with 'Some authors,' which is not a general statement. Paragraph 3 uses 'the character's overall role,' which refers back to the character mentioned in the first paragraph. Paragraph 4 starts with 'Either way,' which is a transitional phrase and does not stand alone.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it concludes the discussion. It uses conclusive words like 'either way' to show that it summarizes the main idea about character analysis.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it continues the idea of character analysis. It uses the Connector strategy, as it explains how some authors add depth to their characters.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it presents a contrast. It uses the Contrast strategy, showing that not all authors add layers to their characters.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it summarizes the importance of understanding characters. It uses the Logical Order strategy, as it wraps up the discussion about character roles.