The correct answer is D. Vitamin D.
Rickets is a softening of the bones in children caused by a lack of vitamin D. This can lead to bowed legs, knock-knees, and other problems with the bones. Vitamin D is important for the absorption of calcium and phosphorus from food. These minerals are essential for the growth and development of strong bones.
Vitamin A is important for vision, skin, and the immune system. Vitamin B is a group of vitamins that are important for energy production, metabolism, and nerve function. Vitamin C is important for the immune system, wound healing, and the production of collagen.
Rickets can be prevented by getting enough vitamin D from sunlight or from foods such as fatty fish, eggs, and fortified milk. It can also be treated with vitamin D supplements.