A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic of political issues related to the Fifth Pay Commission. It does not refer to any previous information, making it independent. It sets the stage for the discussion without going into details. Why other lines are not chosen? The other paragraphs are not chosen because they do not stand alone. For example, Paragraph 2 starts with "How many times..." which is a question and needs context. Paragraph 3 starts with "They argue..." which refers to previous ideas. Paragraph 4 starts with "Here was a commission..." which assumes prior knowledge. Paragraph 5 starts with "Barring P. Chidambaram..." which also needs context.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the discussion about the political opposition to the commission's recommendations. It summarizes the main points and shows the consequences of the actions taken, providing closure to the topic.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it continues the discussion about the Fifth Pay Commission. The question in Paragraph 2 builds on the political issues mentioned in Paragraph 1. This shows a logical order of ideas.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 follows Paragraph 2 because it explains the consequences of the pay hikes mentioned in Paragraph 2. The argument in Paragraph 3 is a direct result of the claims made in Paragraph 2, showing a cause and effect relationship.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it introduces the commission that made the recommendations. This shows a broader to specific strategy, where the general argument about bankruptcy leads to specific details about the commission.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 logically follows Paragraph 4 because it discusses the opposition to the commission's recommendations. This shows a clear topic order, where the details about the commission lead to the political reactions against it.