Cytotoxic t cells self-destruct once the antigen has been neutralized require the double recognition signal of class i mhc plus class ii mhc on the target cell in order to function can directly attack and kill other cells of the body function mainly to stimulate the proliferation of other t cell populations

Cytotoxic T cells are the only T cells that can directly attack and kill other cells.

Explanation:

Cytotoxic T cells, also called killer cells, are the only cells that have the ability to kill cells infected by foreign bodies that are recognized as a threat to the body. These cells act directly on foreign and virus-infected cells or anything else the immune system recognizes as dangerous.

it's not c. i took the quiz and got it wrong. so my best guess is b.

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a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.