The correct answer is option-2, Vitamin C. Vitamin C is the only vitamin that is not found in any animal food. It is mostly found in fruits and vegetables.

Option-1, Vitamin B12, is found in animal products such as meat, fish, and dairy.

Option-3, Vitamin D, is found in fish, eggs, and dairy products. It can also be obtained through sunlight exposure.

Option-4, Vitamin K, is found in leafy green vegetables, eggs, and meat.

Therefore, the only vitamin not found in any animal food is Vitamin C. It is important to note that while Vitamin C is mainly found in plant-based foods, some fortified animal products such as certain juices or cereals may contain added Vitamin C.