Final answer:
The correct option is d. The white blood cell that engulfs bacteria would have the most lysosomes because lysosomes are used to destroy pathogens that enter the cell.
Step-by-step explanation:
The white blood cell that engulfs bacteria would have the most lysosomes. In a process called phagocytosis, a section of the white blood cell's plasma membrane invaginates and engulfs a pathogen (bacteria).
The invaginated section becomes a vesicle, which fuses with a lysosome. The lysosome's hydrolytic enzymes then destroy the bacteria. Therefore, the white blood cell that engulfs bacteria would have the highest concentration of lysosomes.