参考答案

正确答案：C
解析：事实细节题。化验是依靠化学的手段，因为两位发明人都是化学家，而且从最后一段的第一句话中也可以看出，The Jungners predict that advance knowledge about a person's potential ailments by the chemical screening process will result in considerable savings in hospital and other medical costs．因此C是正确答案。