When you have a skin cut, the released blood will usually thicken and form a scab. What is the role of the scab

When your skin is cut, scraped, or punctured, you usually start to bleed. Within minutes or even seconds, blood cells start to clump together and clot, protecting the wound and preventing further blood loss. These clots, which turn into scabs as they dry, are created by a type of blood cell called a platelet.

Explanation:

the answers are a and c