Final answer:
Endocytosis is a form of active transport where the cell membrane engulfs particles, requiring energy to move substances into the cell.
Step-by-step explanation:
Among the options provided, endocytosis is a type of active transport. Active transport is the movement of a substance across a cell membrane from an area of lower concentration to an area of higher concentration, which requires energy, typically in the form of ATP (adenosine triphosphate). Endocytosis involves the plasma membrane of a cell forming a pocket around a target particle, which then pinches off to create an intracellular vesicle. This process is used by cells to ingest large molecules, parts of cells, or whole cells, and is energy-dependent.