The correct answer is C. lymphocytes.
Lymphocytes are a type of white blood cell that play a major role in the body’s immune system. They are responsible for recognizing and attacking foreign invaders, such as bacteria, viruses, and parasites. There are two main types of lymphocytes: B cells and T cells. B cells produce antibodies, which are proteins that bind to and neutralize foreign invaders. T cells kill infected cells and help to regulate the immune response.
Erythrocytes, or red blood cells, are responsible for carrying oxygen throughout the body. Monocytes are a type of white blood cell that can develop into macrophages, which are cells that engulf and destroy foreign invaders.
When the body is infected by an infection, the immune system is activated and lymphocytes are released into the bloodstream. These lymphocytes travel to the site of the infection and attack the invading organisms. They also produce antibodies, which help to neutralize the infection.
The immune system is a complex system that is constantly working to protect the body from infection. Lymphocytes play a vital role in this system and are essential for maintaining health.