when the blood is flowing out from the body

Dear Student,
The correct option is (c) .
Blood is a colloidal solution i.e a mixture in which the substances are regularly suspended in a fluid. A colloid is a very tiny and small material that is spread out uniformly all through another substance.Coagualtion is a complex process in which blood forms solid clots.The process of becoming viscous or thickened into a coherent mass the forming of clots in blood is called coagulation whereby a damaged blood vessel wall is covered by a platelet and fibrin-containing clot to stop bleeding and begin repair of the damaged vessel. Now, it states that higher the charge on cation higher will be its efficiency to coagulate the colloidal solution.In the present case, ferric chloride has Fe3+. Hence, ferric chloride is more effective in enhancing the coagulation rate of blood and stop the bleeding from the cut.So,here coagulation is an important term. Hence option c is the only correct one.
Regards
 

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