A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic of making pizza. It clearly states the first step, which is to prepare the dough. This is an introductory statement that does not need any other sentence for context. It does not use any pronouns or definite articles that refer to previous information. Why other lines are not chosen? Paragraph 2 starts with "After the dough has been prepared," which needs context from the first paragraph. Paragraph 3 starts with "While the dough is rising," which also needs context. Paragraph 4 starts with "Once the dough has risen," which again needs prior information. All these sentences cannot stand alone.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it concludes the process of making pizza. It gives the final steps of assembling and baking the pizza, wrapping up the overall theme of the paragraph.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it follows the logical order of steps in making pizza. After preparing the dough, the next step is to let it rest and rise.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it shows what to do while the dough is rising. This is a logical order of actions.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it describes what to do after the dough has risen and the toppings are ready. This shows a clear sequence of steps.