Answer: C. Immunodeficiency disorders.
Immunodeficiency disorders refer to conditions in which the immune system is compromised, resulting in a reduced ability to fight off infections and diseases. These disorders can be congenital (present at birth) or acquired later in life. Immunodeficiency disorders can be primary, caused by genetic defects affecting the immune system, or secondary, resulting from factors such as certain medications, infections, or medical treatments that weaken the immune response.
An overproduction of lysozymes, muscle disorders, and complement systems in the blood do not directly relate to a weakened immune system. Lysozymes are enzymes that help break down bacterial cell walls and are a part of the innate immune response. Muscle disorders primarily affect the muscular system and do not directly impact the immune system. The complement system is a part of the immune system that assists in the destruction of pathogens, and its activation is not typically associated with a weakened immune system.
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