The process of engulfing foreign material from the surrounding environment is known as phagocytosis. Phagocytosis is also known as cell eating as it eats or engulfs the foreign material which is a part of a larger process called "endocytosis".
Endocytosis is a process of engulfing of macromolecules and non-functional cells. It takes place due to the invagination of the plasma membrane which surrounds the particle which is released into the cytoplasm.
Thus, option A- endocytosis is the correct answer.
Endocytosis is a cellular process in which substances are brought into the cell. The material to be internalized is surrounded by an area of plasma membrane, which then buds off inside the cell to form a vesicle containing the ingested material. Endocytosis includes pinocytosis(cell drinking) and phagocytosis(cell eating).
