The correct option is C Damaged platelets
Blood clotting or coagulation is the process by which blood vessels repair ruptures after injury. Injury repair actually begins even before clotting does. The damaged platelets release a substance called thromboplastin. This sets in action, a series of reactions that result in the formation of clots.
RBCs transport oxygen to all parts of the body.
WBC help fight infections and allergies. Lymphocytes are a type of WBC that trigger immune responses.