I guessed on this but I’m pretty sure this ain’t the right answer. help?

Glycolysis is the first pathway that the cellular respiration process begins with. It is anaerobic (does not require oxygen) and occurs in the cytosol of our cells. Glycolysis is responsible for the conversion of one molecule of glucose (sugar) into two molecules of pyruvate.

the way that the mass of carbon can be conserved through cellular respiration is through a process/law called the law of conservation of mass which even tho it undergoes a process, mass is not be destroyed or changed

option number one would be youre best option