Part of the complement system of defense is opsonization. this process
select one:
a. causes the pathogen to become trapped in mucus.
b. creates an acidic environment that prevents pathogen attachment
c. causes holes to form in the pathogen's cell walls.
d. coats the pathogen exterior so that it is recognized by the host's phagocytes.

The correct answer is option d.

Explanation:

A section of the complement system of defense is opsonization. It is a term that signifies towards an immune procedure where the constituents like bacteria are focused for elimination by an immune cell called phagocyte.  

In the process of opsonization, the exterior of the pathogen gets coated so that it can be determined easily by the host's phagocytes. The opsonins are the constituents, which when coated on the pathogens will develop some kind of handles over them so that the phagocyte can trap them easily.