A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic of research. It sets the stage for what comes next. It does not refer to any previous information, so it is independent. This follows the rule of Topic Sentence. Why other lines are not chosen? Paragraph 2 starts with "Understanding" which is not independent because it needs context. Paragraph 3 starts with "The final step" which refers to something before it. Paragraph 4 starts with "Next" which shows it is not the first sentence.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the process. It uses the phrase "The final step" which shows it is concluding the ideas. This follows the Conclusive Words rule.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it continues the idea of research. The first paragraph talks about research, and the second paragraph explains what to do with that research. This follows the Logical Order rule.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it follows the idea of understanding the market. After knowing the market, the next step is to create a business plan. This follows the Broader to Specific Strategy.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it shows the next step after making a business plan. After planning, you need to launch your website. This follows the Chronological Order rule.