下图为珠江三角洲“桑基鱼塘”发展规模变动示意图，回答问题。

珠江三角洲由传统的“桑基鱼塘”转向“花基鱼塘、菜基鱼塘”，这种变化主要是因为（）

A．农业技术的改进 B．劳动力的转移

C．市场需求的变化 D．自然条件的改变

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下图为珠江三角洲“桑基鱼塘”发展规模变动示意图，回答问题。

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