What is the function of platelets?

• Blood is the circulatory fluid, and contains cells like WBC, RBC, and platelets. 
• Blood circulates through the body and transports oxygen and carbon dioxide through the body. 
• Platelets help in the formation of the blood clot; clots help to slow or stop bleeding and help in wound healing. 
• If the platelet count in the blood is low, it could risk our body for severe bleeding and hemorrhage.
• Skin prevents the entry of foreign particles inside the body.

Hence, the correct option is B.