The correct answer is C. To produce immune system of body.
White blood cells, also known as leukocytes, are cells of the immune system that protect the body against infection. They are produced in the bone marrow and circulate in the blood and lymph. There are five main types of white blood cells: neutrophils, lymphocytes, monocytes, eosinophils, and basophils.
Neutrophils are the most abundant type of white blood cell. They are the first to arrive at the site of an infection and help to kill bacteria and other foreign invaders. Lymphocytes are responsible for producing antibodies, which are proteins that help to fight infection. Monocytes develop into macrophages, which are cells that can engulf and destroy bacteria and other foreign invaders. Eosinophils are involved in allergic reactions and parasitic infections. Basophils release chemicals that help to fight infection.
White blood cells are essential for the body’s immune system. They help to protect the body against infection and disease.
Option A is incorrect because white blood cells do not transport carbon dioxide. Carbon dioxide is transported by red blood cells.
Option B is incorrect because white blood cells do not transport oxygen. Oxygen is transported by red blood cells.
Option D is incorrect because white blood cells are essential for the body’s immune system.