Final answer:
White blood cells, or leucocytes, are produced in the bone marrow. They form an essential part of the immune system and are classified as either granulocytes or agranulocytes. Among the given options, bone is the correct answer for where white blood cells are produced. The option (B) is correct.
Step-by-step explanation:
White blood cells, also known as leucocytes, are primarily involved in the immune response, defending the body against bacteria and viruses. These important cells are produced in various sites within the body, often during the process known as hematopoiesis. One primary site for this production is bone marrow, particularly the red bone marrow found within flat bones.
White blood cells can be classified as either granulocytes or agranulocytes. These classifications are based on their appearance under a microscope and their immune functions. Granulocytes, which include neutrophils, eosinophils, and basophils, are a specific type of white blood cell, another term for which is leukocyte.
Of the options presented (muscle, bone, glands, skin), bone marrow, located within bones, is responsible for the production of white blood cells. Therefore, the correct answer is b. bone.