Answer: b. One binds a receptor called BCR (B-cell receptor), while other recognizes a receptor called called TCR (T-cell receptor).
Explanation:
The B and T cells are the type of white blood cells also called as lymphocytes. Their role is to provide immunity to the human body. The main difference between these cells is that they bind to a specific receptor to function. TCR or T-cell receptor is a molecule which is typically found on the surface of the T cell. The receptor is impotant for recognizing the foreign antigenic fragments to protect the invasion.
The B-cell receptors also helps in recognition of specific antigens over the surface of the B cells. The antibodies are produced in response to this activity to provide immunity to the body.