Final answer:
Neutrophils undergo diapedesis, where they squeeze between capillary endothelial cells, which allows them to exit the bloodstream and move towards the site of infection or injury. The correct option is b).
Step-by-step explanation:
Neutrophils flatten and squeeze between the endothelial cells of the capillary walls during the process known as diapedesis or emigration. This is the mechanism by which leukocytes, including neutrophils, exit the bloodstream to enter the tissues where they are needed, often in response to infection or injury.
As part of the body's immune response, leukocytes such as neutrophils respond to chemical signals from injured or infected cells in a process called positive chemotaxis, directing them to the site where they are needed to perform their defensive functions. Option b) is the correct one.