[单选题]关于管理人内部控制的原则，说法错误的是（ ）。
A.全面性原则：内部控制应当覆盖包括各项业务、各个部门和各级人员，并涵盖资金募集、投资研究、投资运作、运营保障合信息披露等主要环节
B.独立性原则：组织机构应当权责分明、相互制约
C.执行有效原则：通过科学的内控手段和方法，建立合理的内控程序，维护内控制度的有效执行
D.成本效益原则：以合理的成本控制达到最佳的内部控制效果，内部控制与股权投资基金管理人的管理规模和员工人数等方面相匹配，契合自身实际情况

{{B}}To Save Trees, Fighting One Alien Insect with Others{{/B}}
Rusty Rhea sighs wistfully as he talks about the beauty and peace of standing amid a grove (小树林) of deep green hemlocks in Appalachia, some of them up to 160 feet (50 meters) tall and more than 500 years old.
"This is a very special tree," said Rhea, an entomologist for the U.S. Forest Service’s Forest Health Protection program in Asheville, North Carolina. "I was brought up here, and I don’t want to see another species go by the wayside."
The evergreen trees, a hallmark of southern Appalachia’s national parks, are under attack by an invasive insect barely visible to the eye but potent enough to fell the giants of the eastern United States’ old-growth forests.
Already the tiny bug from Japan, known as the hemlock woolly adelgid (HWA), has killed upward of 95 percent of the hemlocks in Virginia’s Shenandoah National Par