单选题 By describing the Heritage Farm as "a living museum of heirloom plants", the organization means that ______.

A、 it has gathered a large collection of various plant seeds that have been handed down for generations within families as valuable objects
B、 it collects jewelries and other valuable objects passed down over time within families living on the farm
C、 it operates a museum of rare plants brought to America by immigrants from Europe
D、 it displays a large variety of lifelike specimens of garden plants passed on within families

【正确答案】 A

【答案解析】[分析] 单句释义题。本题可参考第三段前半部分。这一段第一句即为题目要求释义的句子，作者在第二句中已给出了解释。