The best option that summarizes the process of glycolysis is:
anaerobic; 6-carbon glucose forms two 3-carbon pyruvates; forms a net total of 2 ATP.
Glycolysis occurs in the cytoplasm and does not require oxygen (anaerobic). One molecule of 6-carbon glucose is converted into two molecules of 3-carbon pyruvate, and there is a net gain of 2 ATP molecules from the process.