Answer:
The correct answer is A. The ingestion and destruction of a bacterium by a white blood cell is an example of phagocytosis.
Step-by-step explanation:
Phagocytosis is a type of endocytosis by which some cells (phagocytes and protists) surround solid particles with their cytoplasmic membrane and introduce them into the cell interior. This occurs thanks to the emission of pseudopods around the particle or microorganism until it completely encompasses it and forms around it a vesicle, called a phagosome, which subsequently fuses with lysosomes to degrade the phagocyte antigen.