Pinocytosis is an example of

A. osmosis.

B. simple diffusion.

C. active transport.

D. facilitated diffusion.

C. Active transport

Pinocytosis is the movement of small molecules into the cell by engulfing the small vesicles into the cell. The vesicles fuse with the cell membrane, emptying its contents into the cell. It is a smaller version of endocytosis, which is a form of bulk transport of materials into the cell. Pinocytosis requires energy and thus is an example of active transport, in which energy is required to move substances across the membrane.