Final answer:
Rickets is caused by a deficiency in vitamin D which leads to the malabsorption of calcium. Night blindness is a symptom of a deficiency in vitamin A. Option a.
Step-by-step explanation:
Rickets, a condition characterized by improper bone development in children, is caused by a deficiency in vitamin D which leads to the malabsorption of calcium. Night blindness is a symptom of a deficiency in vitamin A, and poor development of bone and connective tissues is caused by a deficiency in calcium and phosphorous in the diet. Increased risk of prostate cancer is not directly related to a nutrient deficiency or excess. Poor development of bone and connective tissues is caused by a deficiency in calcium and phosphorous in the diet.