What is the function of a basophil?

A. Plays a major role in allergic response by producing histamine; also produces heparin to control blood clotting

B. Functions specifically to combat parasitic infection, they also help to promote inflammation and play a role in allergic reactions

C. One of the first responders in the immune system, it phagocytoses pathogens and may present the phagocytosed antigens to other immune cells

D. Helps the blood clotting process by gathering at the site of an injury, sticking to the lining of the injured blood vessel, and forming a platform on which blood coagulation can occur

E. Functions in transport and gas exchange