A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic of education rights. It is a general statement that does not need other sentences for context. It does not use any pronouns or definite articles that refer to previous ideas. Why other lines are not chosen? Paragraph 2 starts with 'Yet' which is a conjunction, so it cannot be independent. Paragraph 3 starts with 'Over' which is not a general statement. Paragraph 4 starts with 'This' which refers back to something not yet mentioned, so it is not independent.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the discussion about the learning crisis. It summarizes the problem and shows its importance. It gives a final thought on how serious the situation is.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): This pair connects because Paragraph 2 continues the idea from Paragraph 1. It shows a problem with education rights. The word 'Yet' shows a contrast between the right to learn and the reality of schooling.
• Pair 2 (Paragraph 2 → Paragraph 3): This pair connects because Paragraph 3 gives specific details about the problem mentioned in Paragraph 2. It shows how many children are affected by the lack of learning.
• Pair 3 (Paragraph 3 → Paragraph 4): This pair connects because Paragraph 4 explains the learning crisis mentioned in Paragraph 3. It shows that this problem is big and has been around for a long time.