A. vitamin K deficiency
B. Thrombocytopenia
C. Aortic Thromboembolism
D. Hemophilia

Stop trying to cheat lol

Is this a trick question? NONE of those conditions cause excessive clotting of the blood. In fact, three of them r conditions that can cause excessive or unusual bleeding, not clotting.

A vitamin K deficiency can affect the blood is ability to clot & therefore can cause unusual bruising or bleeding.
Thrombocytopenia is a condition in which ur blood has a low number of blood cell fragments called platelets. Platelets r made in ur bone marrow along with other kinds of blood cells. They travel through ur blood vessels & stick together (clot) to stop any bleeding that could happen if a blood vessel is damaged. Therefore, when ur blood has a low number of platelets, mild to serious bleeding can occur. This bleeding can happen inside the body (internal bleeding) or on the skin.
Hemophilia is a rare inherited disorder in which the blood does not clot normally. People who have hemophilia may bleed for a long time after an injury or accident. They also may bleed into their knees, ankles & elbows. Bleeding in the joints causes pain and, if not treated, can lead to arthritis. Bleeding in the brain, a very serious complication of hemophilia, requires emergency treatment.
Aortic thromboembolism is simply a blood clot occurring within the aorta.

So, as u can see, neither A, B, C or D is a correct answer to the question.

May be Aortic Thromboembolism; theoretically an embolus can cause clotting around it.