A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first because it introduces the main topic of gender-typed toy play and its effects on children. It gives a broad overview of how boys and girls develop different skills based on the toys they play with. This follows the rule of Topic Sentence. Why other lines are not chosen? The other paragraphs are not independent because they either refer back to previous ideas or use specific terms that need context. For example, Paragraph 2 starts with "Whereas," which is a conjunction. Paragraph 3 uses "Playing with popular dolls," which refers to a specific type of toy without introducing the topic first. Paragraph 4 uses "In general," which is not a standalone idea. Paragraph 5 starts with "Therefore," which shows it is concluding a thought.

Concluding sentence: Why this is the last line? This paragraph is the last because it wraps up the discussion about gender-typed toys and their effects. It uses the phrase "Therefore," which signals a conclusion. This follows the Conclusive Words rule.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it gives specific examples of the types of toys that lead to different skills. This follows the Broader to Specific Strategy, where the first paragraph gives a general idea and the second provides details.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it continues the discussion about specific toys, focusing on dolls. This follows the Logical Order rule, as it moves from discussing types of toys to their specific effects.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it discusses the overall impact of gender-typed toys on children's skills. This follows the Cause and Effect Relationship rule, as it shows the negative effects of strongly gender-typed toys.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects to Paragraph 4 because it concludes the discussion by stating the consequences of using gender-typed toys. This follows the Conclusive Words rule, as it uses "Therefore" to summarize the earlier points.