Which of the following statements could be used to describe a neutrophil? 

a. They possess the property of phagocytosis. 

b. When activated, they release a pyrogen that causes fever. 

c. When the body is injured, they are produced rapidly and in large numbers. 

d. They are not capable of movement outside the circulatory system. 

e. They are most often seen in response to an allergic reaction. 

f. They float around in the blood and release chemicals in response to injury.