Proteins Found in the Blood Respond to Blood Vessel Damage

Proteins found in the blood respond to blood vessel damage by clumping together forming a clot that physically blocks the hole in the vessel and prevents further blood loss. If clotting proteins were active all the time, they would create clots throughout your circulatory system. Which of the following would be the most efficient way for the body to regulate the expression of the proteins involved in clotting?

A) Produce and store the clotting protein in an inactive form. When the protein is needed, use another protein to activate the clotting protein.
B) Use a repressor protein to keep clotting genes turned off until they are needed.
C) Tightly package the genes for clotting proteins so that RNA polymerase cannot access them unless they are needed.
D) Constantly make the clotting proteins, but then break them down instantly after translation if they are not needed.