Which of the following best describes endocytosis?
A) The process by which cells absorb water from the extracellular environment.
B) The process by which cells secrete substances into the extracellular environment.
C) The process by which cells engulf large particles or droplets into vesicles formed from the plasma membrane.
D) The process by which cells exchange materials with the surrounding environment through diffusion.
E) The process by which cells break down cellular waste materials and foreign substances.