The correct answer is c) endocytosis.
Endocytosis is the process through which cells internalize large particles, molecules, or even other cells by engulfing them within membrane-bound vesicles. This process allows the cell to take in substances that are too large to pass through the cell membrane via diffusion or other transport mechanisms.
During endocytosis, the cell membrane folds inward, creating a pocket that engulfes the external material. This pocket then pinches off, forming a vesicle that carries the material into the cell’s interior. Endocytosis is vital for various cellular functions, such as nutrient uptake, immune responses, and receptor signaling.