A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first line because it introduces the main topic. It talks about the fast food industry and its effects. This is a general statement that sets up the theme of the text. It does not need any other sentence for context. Why other lines are not chosen? The other paragraphs are not chosen because they do not stand alone. For example, Paragraph 2 starts with "The average American..." which needs context. Paragraph 3 starts with "That’s..." which refers to something before it. Paragraph 4 starts with "A recent survey..." which also needs prior information.

Concluding sentence: Why this is the last line? This paragraph is the last line because it wraps up the discussion. It gives a final point about children and fast food. It summarizes the main idea of the text.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it gives specific details about the fast food industry. This is a logical order because it goes from a general statement to specific facts.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it explains the effects of the food mentioned in Paragraph 2. This shows a cause and effect relationship. The facts about fat and calories follow the information about food.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it gives more information about fast food consumption. It shows a broader topic about children eating fast food after discussing the fat and calories.