A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic of Cyber Monday. It gives a broad overview of the day without going into details. It does not use any pronouns or definite articles that would need prior context. Why other lines are not chosen? Paragraph 2 starts with "The" which makes it dependent on prior information. Paragraph 3 starts with "Earlier" which suggests it needs context. Paragraph 4 starts with "These" which refers back to something not yet mentioned. Paragraph 5 starts with "Such" which also needs prior context.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the discussion about Cyber Week. It gives a clear conclusion about the benefits for consumers, which reflects the main theme of the text.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it gives specific information about the sales on Cyber Monday. This follows the Logical Order rule, as it provides evidence for the claim made in Paragraph 1.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it explains how Cyber Monday has changed over time. This follows the Broader to Specific Strategy, as it gives more detail about the topic introduced in Paragraph 2.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it talks about the benefits of the changes mentioned in Paragraph 3. This follows the Logical Order rule, as it shows the result of the expansion of Cyber Monday.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects to Paragraph 4 because it explains how consumers can take advantage of the price drops. This follows the Topic Example rule, as it gives an example of the benefits mentioned in Paragraph 4.