Concept:Vitamin K is necessary for producing clotting factors, so its deficiency affects normal blood coagulation.Explanation:Vitamin K helps the liver synthesize proteins that are essential for blood clotting.A deficiency lowers these clotting factors, causing prolonged bleeding or delayed blood clotting in affected animals.Night blindness is associated with vitamin A deficiency, sterility is linked to vitamin E deficiency, and delayed ovulation is caused by hormonal imbalance.Answer:C. delayed blood clotting