Which blood cells are usually the first to arrive at the site of an infection?

A) neutrophils
B) natural killer cells
C) red blood cells
D) interferons
E) monocytes

Neutrophils are the most abundant type of white blood cell and form an essential part of the innate immune system. They are the first cells to migrate towards the site of infection or inflammation and are responsible for engulfing and destroying invading pathogens.