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."
This describes that glycolysis occurs in the absence of oxygen (anaerobic), it begins with a 6-carbon glucose molecule and ends with two 3-carbon pyruvate molecules, and it results in a net gain of 2 ATP molecules.