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Select the best explanation of how a helper t cell uses either cell-to-cell contact or chemical signaling to enhance the activities of the immune system.
a.chemicals called cytokines are secreted from helper t cells to signal production of antibodies by b cells.
b.the second exposure of the antigen causes the helper t cell to activate memory helper t cells.
c.the pathogen is engulfed by a helper t cell and its antigenic markers are displayed on its surface.
d.the helper t cell stimulates the antigen-presenting cell to release chemicals called cytokines to stimulate the cytotoxic t cells.

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The answer is A.chemicals called cytokines are secreted from helper t cells to signal production of antibodies by b cells.

-Some cells present parts of an pathogen that they thing should be eliminated.This is, for example, what dendritic cells do.

-T helper cells recognize those parts and starts to produce cytokines.

- Those cytokines secreted will stimulate other cells to produce more or to activate.
- B cells, which produce antibodies, will bestimulated by cytokines released by T helper cells.

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