A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first because it introduces the main topic of the event's success. It talks about marketing, which is important for the event. It does not need other sentences to understand it. This follows the rule of Topic Sentence. Why other lines are not chosen? The other paragraphs are not chosen because they do not stand alone. For example, Paragraph 2 starts with "To kick things off," which is a phrase that needs context. Paragraph 3 talks about coordination but does not introduce the main topic. Paragraph 4 also needs the context of the event's success.

Concluding sentence: Why this is the last line? This paragraph is the last because it wraps up the ideas of the event. It talks about what to do after the event, which is a good way to finish. It summarizes the importance of keeping good relations with participants.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it continues the idea of preparing for the event. The phrase "To kick things off" shows that it is the next step after marketing. This follows the Logical Order rule.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 follows Paragraph 2 because after securing sponsors, the next step is to coordinate with local authorities. This shows a clear progression of tasks. This follows the Logical Order rule.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because after the event is planned and coordinated, it is important to follow up with participants. This shows a clear flow of ideas. This follows the Logical Order rule.