The correct answer is Pinocytosis.
Pinocytosis is the process by which a cell ingests liquid materials from its surroundings. It is often referred to as "cell drinking." In contrast, phagocytosis refers to the ingestion of large particles or cells, while exocytosis is the process of transporting materials out of the cell. Passive transport involves the movement of substances across a cell membrane without the use of energy, typically along a concentration gradient.