Answer:
The correct answer will be option- leukocytes.
Step-by-step explanation:
The white blood cells are the colourless cells which circulate in the blood and form an important part of the immune system.
These white blood cells are also known as the 'leukocytes" which are formed in the bone marrow of the body. These leukocytes are of two types- granulocytes which contain granules like in the neutrophils, eosinophils, and basophils, and agranulocytes which lack granules like in monocytes, and lymphocytes.
Thus, option- leukocytes is the correct answer.