题目

(2019·石家庄市重点高中高三毕业班摸底考试)When Gitanjali Rao shared how she likes “finding solutions to real problems”， it was hard to imagine this dynamic girl could settle a problem that had escaped scientists for years. In just three months, Rao came up with a device (装置) that can replace the costly and lengthy tests currently used to reliably determine lead levels in our fresh water. Inspired by the current litigation (诉讼) in Flint, Michigan, a case of water pollution from 2014 until present, Rao designed a new testing system that resulted in her being 10．牙龈出血与缺乏那种维生素有关（　　）A．维生素AB．维生素CC．维生素BD．维生素D