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. It clearly states what a manager's job is. This follows the rule of Topic Sentence. It gives a broad overview without going into details. Why other lines are not chosen? The other paragraphs are not chosen because they do not stand alone. For example, Paragraph 2 starts with 'In order to accomplish this,' which needs context. Paragraph 3 starts with 'However,' which shows a contrast and needs a previous idea. Paragraph 4 also starts with 'However,' which makes it dependent on earlier information.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it summarizes the main idea of the text. It gives a final thought on the topic of motivation. This follows the Summary Style rule.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it explains how a manager can do the job mentioned in Paragraph 1. This follows the Logical Order rule, as it shows a clear flow of ideas.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it shows a challenge in motivating employees. The word 'However' indicates a contrast, which follows the Connector Strategy.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it explains why motivation is difficult. This follows the Broader to Specific Strategy, as it gives more detail about the topic introduced in Paragraph 3.