A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces Ronald Amundsen. It gives a clear overview of who he is. It does not need any other sentence to understand it. 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 'He', which is a pronoun. This means it needs another sentence for context. Paragraph 3 starts with 'Amundsen', but it talks about his plans, which is not an introduction. Paragraph 4 talks about his preparations, which also needs context. Paragraph 5 starts with 'When', 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 story of Amundsen's journey. It shows the final action he took after all his plans and preparations. This follows the rule of Topic Closure.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it continues to talk about Amundsen. This shows a Logical Order. It gives more information about his achievements.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it talks about Amundsen's plans. This shows a Broader to Specific Strategy. It gives more details about his goals.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it shows what Amundsen did after his plans. This follows the Logical Order. It explains the next steps he took.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects with Paragraph 4 because it describes what happened after his preparations. This shows a Chronological Order. It tells the next event in his journey.