An active transport process by which a vesicle moves a large substance out of the cell is known as .

osmosis
endocytosis
exocytosis
diffusion

C. Exocytosis

Explanation:

The first thing we notice is that the question says "active transport". Looking at the answer choices, we see that "osmosis" and "diffusion" are options.

However, remember that osmosis (the diffusion of water from high to low concentration) and diffusion (the movement of particles from high to low concentration) are both passive transport; in other words, they don't require an input of energy. So eliminate them.

Now look at endocytosis and exocytosis. "Endo" means "inner", so "endocytosis" means the cell is engulfing a substance and bringing it inside. However, we want the process where a substance is moved out.

"Exo" means "out", so "exocytosis" means to expel something. That matches here, so our answer is C.

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