Aresearch group has discovered an organism with cells that contain a previously undescribed organelle. they do some tests on the isolated organelle to see if it is involved in any major metabolic reactions. to do this, they incubate these organelles for a period of time and determine changes in the amount of various substances in the suspending solution. the results follow.

glucose: none
co2: increase
o2: none
atp: increase
nadh: increase

based on this analysis, which part of cellular respiration do you conclude is taking place in this organelle?

a) pyruvate oxidation
b) citric acid cycle
c) glycolysis
d) electron transport chain/oxidative phosphorylation
e) glycolysis and the citric acid cycle