Answer :
Passive immunity can occur naturally by administering antibodies obtained from another individual or animal. Thus, option b is correct.
Passive immunity occurs naturally when a person receives antibodies from another source rather than producing them within their own body. This can happen through the placenta from a mother to her fetus, through breast milk, or through the administration of antibodies obtained from another individual or animal. This type of immunity provides immediate protection against a specific pathogen, but it is temporary because the body does not produce its own memory cells to provide long-term immunity. Passive immunity is an important defense mechanism in the early stages of life when the immune system is still developing. It is also used as a treatment for certain infectious diseases and as a preventative measure for individuals who have been exposed to a specific pathogen. Therefore, option B is correct.