A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it gives a general idea about the situation of people in developing countries. It introduces the main topic without going into details. 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 "The COVID-19 pandemic..." which needs context. Paragraph 3 uses "Inequality has consequently worsened..." which assumes prior knowledge. Paragraph 4 starts with "People on the bottom..." which also needs context. Paragraph 5 starts with "They unfairly bear..." which uses a pronoun that refers back to something not yet mentioned.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it summarizes the main idea of the text. It shows the overall impact on people in developing countries. This follows the Summary Style rule.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it explains why the outlook is grim. The COVID-19 pandemic is a reason for the bad situation. This follows the Cause and Effect Relationship rule.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it shows the result of the challenges mentioned. It explains that inequality has worsened because of the pandemic. This follows the Logical Order rule.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it talks about the people affected by the worsening inequality. It explains that those at the bottom face problems. This follows the Broader to Specific Strategy.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects with Paragraph 4 because it explains the impact of the shortcomings mentioned. It shows that these people suffer from global crises. This follows the Cause and Effect Relationship rule.