A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic. It tells us who is the subject (Lyndon B. Johnson) and what he did (introduced important policies). This is a clear overview of the text. Why other lines are not chosen? Paragraph 2 starts with "Many of them" which needs context. Paragraph 3 starts with "For example" which also needs context. Paragraph 4 starts with "However" which shows contrast and needs previous information. Paragraph 5 starts with "These include" which refers back to something not yet mentioned.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the discussion. It summarizes the benefits of Johnson's policies. It gives a clear conclusion to the text.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): This pair connects because Paragraph 2 explains what some of those important policies are. It follows the Logical Order rule, as it continues the idea of Johnson's policies.
• Pair 2 (Paragraph 2 → Paragraph 3): This pair connects because Paragraph 3 gives a specific example of the policies mentioned in Paragraph 2. It uses the Broader to Specific Strategy, as it goes from a general statement to a specific example.
• Pair 3 (Paragraph 3 → Paragraph 4): This pair connects because Paragraph 4 introduces a contrast to the example given in Paragraph 3. It uses the Contrast rule, as it shows that there are more important reasons to remember the policies.
• Pair 4 (Paragraph 4 → Paragraph 5): This pair connects because Paragraph 5 lists the benefits mentioned in Paragraph 4. It follows the Topic Example rule, as it provides examples of the effects of Johnson's policies.