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The following is a tree map of auto market sales volumes in August 2018, with percentages showing year-over-year growth rates. Please answer the questions based on the tree map: 总销量——total sales volumes 轿车——Sedans 德系—— German series 日系—— Japanese series 美系—— American series 法系—— France series 自主—— Domestic 韩系—— South Korean series Considering the sales volumes and year-over-year growth rates of the various series comprehensively, the series that had the greatest impact on sedan market sales changes was:
A. German
B. Japanese
C. American
D. Domestic
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In the sales data for the various series in the third layer, German brands have the highest share. Considering growth rates as well, German brands had the greatest impact on market sales changes.

根据提供的树形图和各系列的销售量及同比增长率,综合考虑对轿车市场销售变化影响最大的系列是:D: 自主(Domestic)。

专业分析如下:

1. **销量基数**:从树形图中可以看到,自主品牌的销售量占据了较大的比例。销售量基数越大,对市场整体影响也就越大。

2. **同比增长率**:自主品牌的同比增长率为-10.0%,虽然是负增长,但由于其基数较大,这一变化对市场整体的影响也更为显著。

3. **其他系列对比**:
- **德系(German)**:同比增长率为-2.0%,虽然也是负增长,但其基数和变化幅度相对较小。
- **日系(Japanese)**:同比增长率为-1.0%,变化幅度较小,对整体市场影响有限。
- **美系(American)**:同比增长率为-10.0%,与自主品牌相同,但其基数较小,影响力不如自主品牌。

综上所述,自主品牌(Domestic)的销售量基数较大且同比下降幅度也较大,因此对轿车市场销售变化的影响最大。选择D: 自主(Domestic)是正确的答案。