Naturally acquired passive immunity can be described as a type of immunity in which antibodies are transferred from the mother to the infant through placenta or through breast feeding. This type of immunity tends to protect the child until the child can develop his/her own immune system. However, this type of immunity is not life long and usually remains from a period of few weeks to 6 months.
(the answer is b)it coulve been a but it say "only" and stress has a lot of effects on the body and c and d are answers to trick you but you have to pay attention to what it actually states
