Answer:
The correct answer is - maternal passive immunity.
Explanation:
Maternal passive immunity is one of naturally acquired passive immunity that refers to an immunity that is conveyed by antibody mediated to the newborn or the fetus by its mother.
It can be occurred naturally provided during pregnancy and through breastfeeding. IgG is dominant antibody that pass through the placenta and through the the mother's milk.
Thus, the correct answer is - maternal passive immunity.