The correct answer is endocytosis.
Endocytosis is the general process by which cells take in materials by engulfing them in a vesicle. It includes both pinocytosis (cell drinking, where the cell takes in liquids and small molecules) and phagocytosis (cell eating, where the cell engulfs larger particles or cells). Both of these processes are types of endocytosis and require energy in the form of ATP. Exocytosis, on the other hand, is the process of releasing materials from the cell, not taking them in.