The protein thrombin involved in coagulation provides the activation for the final step in clotting. Thus, the correct option is B.
What is Clotting?
Clotting may be defined as the procedure in which blood alters into a solid state to construct a thick mass or lump onto the surface of the injured region.
The protein thrombin catalyzes the final step in clotting which transforms fibrinogen into fibrin. Then such fibrin monomers polymerize and construct a mess of fibrin polymers which results in a fibrin clot.
Therefore, the correct option for this question is B.
To learn more about Blood clotting, refer to the link:
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