Which of the following blood component forms a plug at the site of injuries?

The answer is platelets. Platelets are a key component of blood responsible for clotting. When there is an injury or damage to blood vessels, platelets immediately gather at the site and form a plug to prevent excessive bleeding. They adhere to the damaged area and release chemicals that attract more platelets to form a clot, which helps seal the wound and initiate the healing process. Platelets also release substances that help stimulate the constrictions of blood vessels, further reducing blood loss.