Gingivitis is a disease that occurs around the teeth and that can lead to periodontitis, a condition that leads to tissue destruction in the gums and even to tooth loss. Studies show that diets high in vitamin C can help to both prevent gingivitis and treat periodontitis.

Which of the following is best supported by the statements above?

(A) People whose diets are high in vitamin C are less likely to contract periodontitis than those whose diet are low in vitamin C.
(B) Periodontitis is a condition only contracted by those who have previously contracted gingivitis.
(C) Increasing the amount of vitamin C in one's diet has helped some periodontitis patients reduce the severity of that condition.
(D) A periodontitis treatment plan that does not include vitamin C is less effective than a plan that does.
(E) Some people suffering from periodontitis do so without having contracted gingivitis.

OA C

Source: Veritas Prep