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 gives a broad overview of the importance of location for restaurants. This follows the rule of Topic Sentence. It does not use any phrases that need prior context, so it stands alone. Why other lines are not chosen? Paragraph 2 starts with 'Once', which is a conjunction, so it cannot be independent. Paragraph 3 starts with 'All', which is a pronoun and needs context. Paragraph 4 starts with 'Restaurateurs', which is a specific noun and assumes prior knowledge.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the discussion. It gives a specific example of what restaurants do to improve access, which reflects the overarching theme of the text.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it continues the idea of location. It shows what happens after restaurants are established, following the Logical Order rule.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it explains what restaurants can do to help their situation. This follows the Cause and Effect Relationship rule.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it gives an example of how restaurants improve access. This follows the Topic Example rule.