Antibodies and antigens
Answer: B
Explanation:
The White blood corpuscles or shortly called WBC are involved in protecting the body from the pathogenic and foreign substance which are called antigens.
The WBC when senses the antigens, it immediately signals the T cells for the production of antibodies which reaches the infection site.
In the site, antigen-antibody interaction occurs due to which the antigen gets destroyed.
Thus it can be inferred that option B is best answer form the choice provided.