The correct option is A 14
Starting from one molecule of 3-phosphoglycerate in glycolysis, there will be 1 NADH formed from the formation of pyruvate and they will form 2 acetyl co-A.
One molecule of acetyl CO-A that enters the Kreb's cycle will form 3NADH and 1FADH2. These NADH and FADH2 will now take part in ETS.
Total 4 NADH will give 4 × 3 = 12 ATP.
Total 1 FADH2 will give 1 × 2 = 2 ATP.
So, total of 14 ATP will be formed.