A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic of planning a picnic. It sets the stage for what comes next by discussing the first step in the process. This follows the rule of Topic Sentence, as it gives a broad overview of the planning process without going into specifics. Why other lines are not chosen? The other paragraphs are not chosen because they do not stand alone. For example, Paragraph 2 starts with 'Once the date is set,' which needs context from the first sentence. Paragraph 3 starts with 'Following the menu planning,' which also needs prior information. Paragraph 4 starts with 'Packing games and activities,' which assumes earlier steps are known. Paragraph 5 starts with 'Finally,' indicating it is not the first point.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the planning process. It uses the word 'Finally,' which signals that this is the last step. It summarizes the key point of ensuring safety during the picnic.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 logically connects with Paragraph 1 because it follows a chronological order. After determining the date, the next step is to create a menu. This shows a clear flow of ideas.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 through a logical order. After planning the menu, the next step is to compile a list of supplies. This shows a clear progression in the planning process.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it continues the topic of picnic planning. After gathering supplies, packing games is another important step. This shows a logical order in the planning.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects with Paragraph 4 through a cause and effect relationship. After packing games, the next step is to ensure food safety. This shows a clear flow of ideas leading to the final preparations.