Liver-oil of fish is known for being rich in various vitamins, making it a valuable dietary supplement. One of the key vitamins that is abundant in fish liver oil is Vitamin A. Vitamin A is a fat-soluble vitamin that plays a crucial role in maintaining healthy vision, boosting the immune system, and promoting proper growth and development. It is particularly important for maintaining the health of our skin and mucous membranes. Vitamin A also plays a role in supporting reproductive health and is essential for the normal functioning of our reproductive system. Therefore, option 1, which states that liver-oil of fish is rich in Vitamin A, is correct. It is important to note that while fish liver oil may contain other vitamins, such as Vitamin D and Vitamin E, they are not as abundant as Vitamin A.