A nursing infant is able to obtain disease-fighting antibodies, which are large protein molecules, from its mother’s milk. These molecules probably enter the cells lining the baby’s digestive tract via:.
a. osmosis
b. passive transport
c. exocytosis
d. endocytosis

D

Explanation:

A is not possible because osmosis is a term given only for the movement of water down it's potential through a partially permeable membrane.

B is not possible since the molecule is big and since it's an antibody, it's polar. It being polar makes it impossible to passively cross the phospholipid bilayer of the cell membrane.

C is not possible because it describes the action of something bulky leaving the cells, not entering them.

Endocytosis is the uptake of large molecules into the cells by forming phagocytic or pinocytic vesicles.

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