关于 指代的题目 求NN解释一下

Between 1990 and 2000 the global economy grew more than it did during the 10,000 years from the beginning of agriculture to 1950.

• ABetween 1990 and 2000 the global economy grew more than it did during the 10,000 years from the beginning of agriculture  分析A选项
• BBetween 1990 and 2000 the growth of the global economy was more than that during 10,000 years, from when agriculture began  分析B选项
• CThe growth of the global economy between 1990 and 2000 exceeds that which had been for 10,000 years from the beginning of agriculture  分析C选项
• DThe growth of the global economy between 1990 and 2000 exceeds what it has been for 10,000 years, from when agriculture began  分析D选项
• EThe growth of the global economy between 1990 and 2000 exceeded what it did for the 10,000 years from the beginning of agriculture  分析E选项A是正确答案   可是it不是指代同状态的  名词么  it 应该指的不是 1990-2000的全球经济么？   B 我不太清楚from when   。。。。to 有什么不妥  求解释  这题我错选了B