Which of the following is a rich source of vitamin K?

Dark leafy greens are recognized as a rich source of vitamin K due to their high chlorophyll content, which is closely associated with this essential vitamin. Foods such as kale, spinach, collard greens, and Swiss chard are particularly noted for their impressive vitamin K levels. This vitamin plays a critical role in blood clotting and bone health, making dark leafy greens an important component of a balanced diet.

In contrast, dairy products, whole grains, and fruits high in vitamin C do not contain significant amounts of vitamin K. Dairy products may have some vitamin K but not at levels comparable to dark leafy greens. Similarly, whole grains and fruits like oranges or strawberries, while nutritious, are not known for their vitamin K content, further emphasizing the superiority of dark leafy greens as a source of this nutrient.