Which of the following represents a major source of Vitamin K?

The major source of Vitamin K is found predominantly in green leafy vegetables. These vegetables, such as kale, spinach, collard greens, and broccoli, are rich in phylloquinone (Vitamin K1), which plays a crucial role in blood clotting and bone health. This vitamin is essential for synthesizing proteins that regulate bleeding, making its presence in a diet particularly important for maintaining overall health, especially in terms of coagulation processes.

While fish and poultry, citrus fruits, and dairy products contain various vitamins and nutrients, they are not significant sources of Vitamin K. Fish and poultry might provide other essential nutrients like protein and Omega-3 fatty acids, citrus fruits are known for their high Vitamin C content, and dairy products are a good source of calcium and Vitamin D. However, none of these are particularly noted for their Vitamin K content when compared to green leafy vegetables. Thus, green leafy vegetables stand out as the primary source for this vital nutrient.