Multiple Choice
Use the letters marking parts of the diagram of the measurement process to identify the following part: Conceptualization of the dependent variable. 
Definitions:
WBCs
White Blood Cells; cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders.
Macrophages
A type of white blood cell part of the immune system, responsible for detecting, engulfing, and destroying pathogens and cellular debris.
Lymphocytes
A type of white blood cell that plays an essential role in the body’s immune response, involved in protecting the body against antigens.
Lymphocytes
White blood cells that play a significant role in the immune system, including T cells and B cells.
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