[SC悬赏令] 关于which跳跃指代的一个新想法~ 求拍

Unlike the buildings in Mesopotamian cities, which were arranged haphazardly, the same basic plan was followed for all cities of the Indus Valley: with houses laid out on a north-south, east-west grid, and houses and walls were built of standard-size bricks.

• Athe buildings in Mesopotamian cities, which were arranged haphazardly, the same basic plan was followed for all cities of the Indus Valley: with houses  分析A选项
• Bthe buildings in Mesopotamian cities, which were haphazard in arrangement, the same basic plan was used in all cities of the Indus Valley: houses were  分析B选项
• Cthe arrangement of buildings in Mesopotamian cities, which were haphazard, the cities of the Indus Valley all followed the same basic plan: houses  分析C选项
• DMesopotamian cities, in which buildings were arranged haphazardly, the cities of the Indus Valley all followed the same basic plan: houses were  分析D选项
• EMesopotamian cities, which had buildings that were arranged haphazardly, the same basic plan was used for all cities in the Indus Valley: houses that were  分析E选项
• 在OG的解析种说A选项的which were arranged 指代不清，不清楚是指代buildings 还是 cities.
• 我的疑惑是根据跳跃指代的法则，which were arranged 这个不是应该直接修饰buildings的么，为什么会有机会修饰cities呢，毕竟in M cities这是个介词短语啊？
• 求NN们解答！