A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main action of the meeting planning. It sets the stage for what will happen next. It does not refer to any previous information, so it is independent. This follows the rule of Topic Sentence. Why other lines are not chosen? Paragraph 2 starts with 'I sent out', which uses a pronoun 'I' that refers back to the speaker, so it is not independent. Paragraph 3 starts with 'To conclude', which suggests it is not the beginning but rather an ending action. Paragraph 4 starts with 'Our discussion', which uses 'Our' as a pronoun that refers back to the group, making it not independent.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the meeting. It uses the phrase 'To conclude', which signals that this is the final action. This follows the rule of Conclusive Words.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it follows the logical order of events. After polling members, the next step is to send out invitations. This shows a clear flow of ideas.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it continues the topic of the meeting. After sending invitations, the next part is the discussion that happened. This shows a logical order.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it shows what happened after the discussion. After a rich discussion, it makes sense to conclude with a vote. This follows a logical order.