Los anticuerpos o inmunoglobulinas, son proteínas que cumplen la función A) de defensa. B) de transporte. C) contráctil. D) enzimática. E) de reserva.

The correct answer is A) defending.

Explanation:

Antibodies correspond to proteins of the immune system which recognize and neutralize foreign agents to the body (eg viruses, bacteria, toxins). They are produced by type B lymphocytes. By recognizing foreign agents (antigen) the antibodies circulate in the blood attacking them and generating immunity, before a new attack by the same agent.