Correct answer is (d) 38
The explanation: A total of 10 NADH’s is made (in glucolysis and the Krebs cycle) per glucose, and 2 FADH2‘s. We generally say that you get 3 ATPs per NADH and 2 per FADH2, so that these carriers produce a total of 30+4 = 34 ATPs and the Krebs cycle itself produces 2 GTPs, which are equivalent to 2 more ATPs, for a total of 38.