Final answer:
Eosinophils are the white blood cells most directly involved in protecting the body against parasitic infections.
Step-by-step explanation:
The type of white blood cell that is most directly involved in the protection of the body against parasitic infections is e. Eosinophils. Eosinophils are a type of white blood cell that target and destroy parasites, such as worms and other multicellular parasites. They release toxic substances that help kill the parasites and limit their spread.