Which sequence is correct for the following events?
1. fibrinogen ? fibrin
2. clot retraction
3. formation of thromboplastin
4. prothrombin ? thrombin
A) 3, 4, 1, 2
B) 1, 2, 3, 4
C) 4, 3, 1, 2
D) 3, 2, 1, 4
Answer: A