A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic of Google's email scanning. It gives a broad overview of what Google does with emails without needing other sentences for context. It does not use any pronouns or definite articles that refer to previous information. Why other lines are not chosen? Paragraph 2 starts with "This advertising practice" which refers back to something not yet mentioned, so it is not independent. Paragraph 3 starts with "The company" which also refers back to Google, so it is not independent. Paragraph 4 starts with "Google has stated" which uses a definite article and assumes prior knowledge. Paragraph 5 starts with "In June 2017" which gives a specific time and assumes prior context.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the discussion about Google's email practices. It provides a conclusion about the changes in their advertising methods, which reflects the overarching theme of the text.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): This pair connects because Paragraph 2 explains the criticism of the practice mentioned in Paragraph 1. It shows a logical order where the scanning of emails leads to concerns about privacy.
• Pair 2 (Paragraph 2 → Paragraph 3): This pair connects because Paragraph 3 talks about the lawsuits that are a result of the concerns mentioned in Paragraph 2. It shows a cause and effect relationship.
• Pair 3 (Paragraph 3 → Paragraph 4): This pair connects because Paragraph 4 provides information about Google's response to the lawsuits mentioned in Paragraph 3. It shows a logical order where the lawsuits lead to Google's statements.
• Pair 4 (Paragraph 4 → Paragraph 5): This pair connects because Paragraph 5 discusses a change in Google's advertising practices, which relates to the automated processing mentioned in Paragraph 4. It shows a progression from what Google claims to what they plan to do.