The major cell infected by HIV is

Explanation

The correct answer is helper T-lymphocytes (option C). Leukocytes are white blood cells involved in immunity, including neutrophils, eosinophils, basophils, monocytes, and lymphocytes. Monocytes are phagocytic cells that engulf pathogens and produce cytokines. B-lymphocytes produce antibodies when activated by helper T-lymphocytes. Helper T-lymphocytes coordinate the immune response by producing cytokines that activate other immune cells, and HIV specifically targets these cells, leading to AIDS.