A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic of self-sufficiency. It gives a clear definition of what self-sufficiency means. This is an introductory statement that sets the stage for the following sentences. Why other lines are not chosen? The other paragraphs are not chosen because they do not stand alone as the first sentence. For example, Paragraph 2 starts with 'This includes,' which means it needs more context. Paragraph 3 starts with 'You can use,' which also needs a prior idea. Paragraph 4 starts with 'This skill,' which refers back to something already mentioned.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the discussion about self-sufficiency. It gives a final benefit of self-sufficiency, which is starting new projects. This shows the overall importance of the skill.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it gives more detail about self-sufficiency. It explains that self-sufficiency includes knowing when to ask for help. This shows a logical order from a general idea to a specific example.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it explains how self-sufficiency is useful in a specific role, like being a team leader. It shows a logical order from knowing when to ask for help to using self-sufficiency in a job.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it continues to explain the benefits of self-sufficiency. It shows another way self-sufficiency is helpful, which is starting new projects. This keeps the focus on the advantages of being self-sufficient.