Answer:
D. Vitamin C
Explanation:
Consider the important points that have been mentioned in the question. These will help in the identification of vitamin which is deficient in the diet. The points are -
All these facts indicate towards the deficiency of Vitamin C in her diet. Because it is found in fruits and vegetable and it helps to boost the immunity and wound healing capacity of our body. Also, it is beneficial for gums to keep them healthy.