阅读以下关于项目质量管理的案例说明，根据要求回答问题1～问题3。
[说明]
某系统集成公司中标了某大型餐饮连锁企业集团的信息系统项目，该项目包含单店管理、物流系统和集团ERP等若干子项目。由该系统集成公司的项目经理老林全面负责项目实施。老林认为此项目质量管理的关键在于系统地进行测试。
老林制订了详细的测试计划用来管理项目的质量。在项目实施过程中，他通过定期发给客户测试报告来证明项目质量是有保证的。可是客户总觉得有什么地方不对劲，对项目的质量还是没有信心。

中国近年来年平均淡水资源总量为28000亿立方米，居世界第六位。( )

A. In recent years, China's average annual amount of freshwater resources has been 2,800 billion cum, ranking sixth in the world.
B. In recent years, China's average annual amount of freshwater resources has been 2,8000 billion cum, ranking sixth in the world.
C. In recent years, China's average annual amount of freshwater resources has been 2,800 billion cum, ranked sixth in the world.
D. In recent years, China's average annual amount of freshwater sources has been 2,800 billion cum, ranking sixth in the world.