HIV attacks which one of the following cells?

T-helper cells

The correct answer is Option (2) → T-helper cells 

HIV (Human Immunodeficiency Virus) primarily targets and infects T-helper cells (also called CD4+ T cells). These cells are a crucial part of the immune system and help coordinate the immune response.

• T-helper cells are vital for activating other immune cells, including B cells (which produce antibodies) and T-cytotoxic cells (which kill infected cells).
• HIV binds to the CD4 receptor on T-helper cells, entering and destroying them, which weakens the immune system over time. This leads to immune deficiency, making the body more susceptible to infections.