What is the primary function of Vitamin K in the body?

Vitamin K plays a crucial role in the body's ability to regulate normal blood clotting and to respond effectively to injuries. This vitamin is essential for the synthesis of certain proteins known as clotting factors, which are integral to the coagulation process. When an injury occurs, these clotting factors are activated to form a clot and stop bleeding, thus preventing excessive blood loss.

The other options pertain to different functions of various vitamins or nutrients. While certain vitamins such as D play a significant role in calcium absorption, and others contribute to energy metabolism or immune support, Vitamin K's primary and well-established role is specifically tied to its function in blood clotting. This unique aspect of Vitamin K is essential for maintaining hemostasis and is vital for overall health, especially during injuries. Understanding this function underscores the importance of adequate Vitamin K intake in the diet for effective blood coagulation.