Loss of the Gocha mangrove forests has caused coastal erosion, reducing fish populations and requiring the Gocha Fishing Cooperative (GFC) to partially fund dredging and new shore facilities. However, as part of its subsidiary businesses, the GFC has now invested in a program to replant significant parts of the coast with mangrove trees. Given income from a controlled harvest of wood with continuing replanting, the mangrove regeneration effort makes it more likely that the cooperative will increase its net income.


Which of the following, if true, would most strengthen the argument that mangrove replanting will increase the Gocha cooperative's net income?    


The cost of dredging and shore facilities was shared with the local government.    

The GFC will be able to hire local workers to assist with the mangrove replanting.    

The GFC derives 10 percent of its revenue from salt-production facilities in an area previously cleared of mangroves.   

Mangrove forests tend to increase the commercial fish populations in coastal fishing grounds.    

A controlled harvesting of mangrove wood by the GFC would have little effect on coastal erosion.    

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情景：Gocha森林的减少导致海岸侵蚀，鱼的数量减少，并且要求GFC为疏通淤泥、新的海岸设备提供资金。然而，作为子公司，GFC投资了一个项目——重新种植mangrove。根据重新种植带来的收入，公司有可能会增加其净收入。

推理：前提和结论都在最后一句，且直白：

（因）前提：重新种植mangrove

（果）结论：公司可以增加净收入

选项分析：

A选项：当地政府会承担一部分疏通淤泥和新设备的成本：我们讨论的是重新植树对净收入的影响，而不是疏通淤泥和新设备对净收入的影响。

B选项：GFC会雇当地人协助重新植树：无关讨论。

C选项：GFC有10%的收入来自一个以前没有红树林的地区的产盐设施：这个其实指出种植mangrove带来的一个对利润的“负面影响”，种了树之后，这个地方无法在建立产盐设备，那么也不会有这10%的收入。

D选项：正确。Mangrove会增加沿海渔场的商业鱼类数量：种植mangrove带来的一个好处是让鱼类数量回增，又是“商业”鱼，所以肯定是可以带来收入的。

E选项：GFC对红树林的控制采伐对海岸侵蚀几乎没有影响：没有影响≠带来净收入。

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