Which of the following is a characteristic of fat-soluble vitamins?

Fat-soluble vitamins, which include vitamins A, D, E, and K, are characterized by their ability to dissolve in fats and oils. The correct answer highlights that these vitamins can accumulate in body fat. This characteristic is significant because it allows for a storage mechanism; the body can draw on these reserves when dietary intake is insufficient.

Unlike water-soluble vitamins, which are readily excreted through urine and typically need to be consumed more regularly, fat-soluble vitamins are retained in the body's adipose tissue and the liver. This can lead to toxicity if excess amounts are consumed over time, as the accumulated vitamins can reach harmful levels.

The other options are misleading regarding the nature of fat-soluble vitamins. They do not require water for absorption; they are absorbed along with dietary fats in the digestive tract. They are not easily excreted in urine due to their fat-soluble nature, and they are indeed essential for various bodily functions, including vision, bone health, and antioxidant functions.