Which of the Following Is NOT True of Naturally Acquired

Multiple Choice

Which of the following is NOT True of naturally acquired immunity? 

A) It is the gain of adaptive immunity through normal events, such as exposure to an infectious agent.
B) It involves injecting a person with antibodies produced by other people or animals.
C) It occurs as a result of breast feeding; the secretory IgA in breast milk protects the digestive tract of the child.
D) It occurs during pregnancy when the mother's IgG antibodies cross the placenta and protect the fetus.
E) These all characterize naturally acquired immunity.