A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic of the text. It tells us that people have different reasons for going on pilgrimages. This is a general statement that sets the stage for the following paragraphs. It does not use any pronouns or definite articles that would need prior context. Why other lines are not chosen? The other paragraphs are not chosen because they do not meet the criteria for being independent. For example, Paragraph 2 starts with 'Some' which is a pronoun, so it cannot stand alone. Paragraph 3 starts with 'Others' which is also a pronoun. Paragraph 4 starts with 'The' which refers to something specific and assumes prior knowledge.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the ideas presented in the text. It gives a final thought about how the journey can deepen a person's faith. This is a conclusive statement that summarizes the overall theme of the paragraphs.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it gives a specific reason for going on pilgrimages. The word 'Some' shows that it is one of the reasons mentioned in Paragraph 1. This follows the Broader to Specific Strategy.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it introduces another reason for going on pilgrimages. The word 'Others' shows that it is another group of people with a different reason. This follows the Logical Order.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it talks about another aspect of the pilgrimage experience. It shows how the journey can help people, which is another reason related to the pilgrimage. This follows the Topical Order.