Answer: Option D
Step-by-step explanation:
The helper T-cells in the body plays a major role in stimulating and regulating the whole process of cellular immunity.
Helper T-cells are also most important when it comes to adaptive immunity. They help in activating the B cells to produce antibodies and macrophages.
They also activates the cytotoxic T cells to kill the infected cells of the body. In this way T cells controls the whole process of fighting with the pathogens and killing the infected cells of the body.