A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic of disaster recovery and business continuity. It does not refer to any previous information and sets the stage for the following ideas. It is a general statement that stands alone. Why other lines are not chosen? Paragraph 2 starts with "This" which is a pronoun and needs context. Paragraph 3 starts with "In Japan" which is specific and does not introduce the main topic. Paragraph 4 starts with "The reason" which refers back to something not yet mentioned. Paragraph 5 starts with "Since its founding" which also assumes prior knowledge.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it summarizes the main points about AT TOKYO's reliability and operations. It wraps up the discussion about why companies trust AT TOKYO.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it shows a cause and effect relationship. The interest in data centers is a result of the need for disaster recovery and business continuity.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 follows Paragraph 2 logically because it gives a specific example of where this interest is happening. It shows the logical order of general interest leading to specific companies in Japan.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it explains why companies are choosing AT TOKYO. It provides a reason for the previous statement about companies finding data center services.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 follows Paragraph 4 because it gives evidence for the trustworthiness mentioned. It shows the logical order of a claim about trust leading to the explanation of AT TOKYO's operations.