The human body has three lines of defense.
-The first line of defense is physical and chemical barriers, such as the skin, mucous membranes, enzymes, stomach acids, and antimicrobial molecules.
-The second line of defense corresponds to nonspecific innate responses, cellular responses, for example, the phagocytes, proteins, for example, the complement system, and other responses like fever and inflammation.
-The third barrier of defense corresponds to the adaptative immune system and it consists of the immune response carried on by the T-cells, B-cells, and antibodies.
All of the options are parts of the three lines of defense of the organism, A and B correspond to the first line of defense, C corresponds to the second line of defense, and D corresponds to the third line of defense.
None of the given options is a correct answer to the question.