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Option 4: "stone walls"
Explanation: This option is correct as it directly matches the description in the text. The phrase 'massive (stone walls)' indicates that the Berlin Wall was constructed from stone, which aligns perfectly with the context of the text discussing the physical attributes of the wall.
Option 1: "buildings"
Explanation: The term 'buildings' does not accurately describe the physical structure referred to in the text. The text specifically mentions 'massive (stone walls)' as the final form of the Berlin Wall, indicating that the wall was not merely a collection of buildings but a solid barrier.
Option 2: "glass structures"
Explanation: 'Glass structures' contradicts the description in the text. The text clearly states that the Berlin Wall was made of 'massive (stone walls),' which implies a sturdy and solid construction, not something fragile or transparent like glass.
Option 3: "electric fencing"
Explanation: While electric fencing could be a form of security, it does not match the description provided in the text. The text refers to 'massive (stone walls),' indicating a physical barrier rather than a type of fencing, which further emphasizes the solid nature of the wall.
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