Examine the Figure Below

Examine the figure below.
Why is only one of the lymphocytes in this diagram activated by the pathogen?

A) Antigens move through the immune system by diffusion, so the lymphocyte closest to the site of infection binds the antigen first. Once a lymphocyte is activated, it produces chemicals that prevent the activation of other lymphocytes.
B) Lymphocytes are only activated if all of their receptors are bound by antigens. In this case, there were only enough antigens to fully activate one cell.
C) Your immune system contains many different lymphocytes, each displaying a different antigen-binding protein. In this case, the antigen only matched the binding protein on the cell that was activated.
D) Lymphocytes can only be activated by chemicals produced by the innate immune system. Only one of the cells in this diagram has been exposed to these chemicals.