[A] : Blood platelets play a very important role in coagulation of blood.
[R]: When blood is shed, the platelets disin- tegrate and liberate thromboplastin which activates prothrombin into thrombin.

Options

A. 1)If both A and R are true and R is the correct explanation of A
B. 2)If both A and R are true but R is not the correct explanation of A
C. 3)If A is true and R is false
D. 4)If both A and R are false

Answer

A