Night blindness, or nyctalopia, is a condition in which a person has difficulty seeing in low-light conditions or at night. It is commonly caused by a deficiency of Vitamin A.

Vitamin A is essential for the production of rhodopsin, a pigment found in the eye`s retina that helps in low-light vision. When there is a deficiency of Vitamin A in the diet, the production of rhodopsin is affected, leading to impaired night vision.

Option 2, Vitamin B, is not directly related to night blindness. While B vitamins are important for overall eye health, they do not play a specific role in low-light vision.

Option 3, Vitamin C, is not related to night blindness. Vitamin C is primarily known for its role in immune function and is not directly involved in vision.

Option 4, Vitamin D, is also not related to night blindness. Vitamin D is important for bone health and immune function but does not play a role in vision.

In conclusion, the correct answer is option 1, Vitamin A, as a deficiency of this vitamin can lead to night blindness.