Some farms are expanding their mix of crop species in an effort to reduce nonagricultural biodiversity loss caused by increasing agricultural specialization, in which farmers focus on a limited range of crops or livestock species to improve yields and, thus, their revenues. To study the joint environmental and economic effects of diversification practices (which can encompass improved soil and water management as well as increased variety in crops and livestock), Laura Vang Rasmussen and team analyzed data from 2,655 farms in eleven countries. They found that using multiple diversification practices concurrently had greater potential for improving both nonagricultural biodiversity and yields than using a single strategy did. Their finding suggests that ______
Which choice most logically completes the text?
A. farmers who focus primarily on increasing crop variety without engaging in other diversification practices will likely help reverse nonagricultural biodiversity loss, but their farms will produce smaller yields than if they had continued to focus on developing a single crop.
B. it is more expensive to increase crop variety while simultaneously implementing other diversification practices than it is to increase crop variety and then subsequently implement other diversification practices.
C. farmers who are reluctant to switch from specializing in a single crop to cultivating a variety of crops incorrectly assume that any improvements in yields will be insufficient to offset the costs associated with making that transition.
D. agricultural diversification doesn't inherently involve a tradeoff between environmental and economic considerations, but farmers' chances of avoiding that outcome may be diminished if they focus on crop variety to the exclusion of other diversification practices.
翻译：
一些农场正在扩大其作物种类的混合，以减少因农业专业化日益增强而导致的非农业生物多样性丧失。农业专业化是指农民专注于有限范围的作物或牲畜种类，以提高产量，从而增加收入。为了研究多样化实践（既包括改善土壤和水资源管理，也包括增加作物和牲畜的种类）对环境和经济的联合影响，Laura Vang Rasmussen 及其团队分析了来自 11 个国家 2655 个农场的数据。他们发现，同时使用多种多样化实践比仅使用单一策略在提高非农业生物多样性和产量方面具有更大的潜力。因此，他们的发现表明，______
解析：
文本结构分为两层：第一层指出农业专业化（单一化）虽然能提高产量和收入，但会导致非农业生物多样性丧失。第二层引入研究发现：同时使用多种多样化实践（如增加作物种类 + 改善土壤/水管理）比只用单一策略（如只增加作物种类）在提升生物多样性和产量两方面都更有潜力。由此推导出结论：多样化本身并不必然导致环境与经济的权衡（因为多种策略并用可以兼得），但如果农民只关注增加作物种类而排除其他实践，则仍可能面临这种权衡。
选项分析：
A. farmers who focus primarily on increasing crop variety without engaging in other diversification practices...
错误。文本未比较“只增加作物种类”与“继续单一化”的产量高低。
B. it is more expensive to increase crop variety while simultaneously implementing other diversification practices...
错误。文本未涉及成本比较或实施顺序。
C. farmers who are reluctant to switch from specializing in a single crop to cultivating a variety of crops...
错误。文本未讨论农民的心理认知或对成本的误判。
D. agricultural diversification doesn't inherently involve a tradeoff between environmental and economic considerations...
正确。完全对应上述逻辑链条。
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