A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first line because it introduces the main topic. It tells us about Rosa Parks and her important action on the bus. This is a clear topic sentence that sets the stage for the rest of the text. It does not need any other sentence for context. Why other lines are not chosen? Paragraph 2 starts with 'She' which is a pronoun. This means it needs more information to understand who 'she' is. Paragraph 3 starts with 'Parks’ arrest' which refers back to Parks, so it is not independent. Paragraph 4 starts with 'Parks was chosen' which also refers back to Parks. Finally, Paragraph 5 starts with 'In many ways,' which is a transitional phrase. All these reasons make them not independent.

Concluding sentence: Why this is the last line? This paragraph is the last line because it wraps up the main ideas. It shows the overall impact of the Montgomery bus boycott and how it started a bigger movement for equality. This is a summary style that brings together the earlier points.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it explains what happened after Rosa Parks refused to give up her seat. This shows a logical order of events.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it explains the effect of her arrest. It shows how her arrest was part of a bigger plan, which is a cause and effect relationship.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it explains who was chosen to lead the movement after the boycott started. This shows a logical order of ideas.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects to Paragraph 4 because it shows the result of Parks being chosen. It explains how the boycott became a larger movement for equality, showing a broader to specific strategy.