निम्नलिखित में से कौन-सा विटामिन रक्त स्कंदन के लिए आवश्यक है?

Vitamin K is essential for blood clotting: the liver needs it to make several clotting factors (such as prothrombin). A deficiency causes excessive bleeding. Vitamin D is for calcium absorption and bones, Vitamin A for vision, and Vitamin E is an antioxidant.