Lymphocytes produce special proteins against foreign invaders called

antibodies

Explanation:

Lymphocytes defend the human body from any foreign element (known as antigen) by producing antibodies. Each lymphocyte, also known as B cell produce specific antibody.  

A lymphocyte gives rise to plasma cell which acts like a factory of antibodies.  

There are two type of lymphocytes which act against the antigens in following ways –  

B lymphocytes – they kill antigens by producing antibodies

T lymphocytes – They act against the antigen in two ways a) by producing  lymphokines which signal other cells and b) directly destroy targeted cells on direct contact.

option number one would be youre best option

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