Kayla was a participant in a clinical study to determine how much vitamin c cures scurvy, the vitamin's deficiency disease. during the study, kayla consumed only a formula diet that was nutritionally complete, except it did not contain vitamin c. within a few weeks, kayla developed scurvy. at that point, researchers gave 2 mg vitamin c to kayla each day for a week, but her signs and symptoms of scurvy remained. in the weeks that followed, the scientists continued to increase kayla's intake of the vitamin by 2 mg/week. after a week of taking 10 mg of vitamin c/day, kayla reported feeling much better. based on this information, the researchers concluded that kayla'sa. rda for vitamin c is 10 mg, plus 15 mg as a margin of safety. b. requirement for vitamin c was 10 mg. c. er for vitamin c was about 10 mg. d. ai for vitamin c was 100 mg, which is 10 times that amount that cured her case of scurvy