In this representation of Krebs Cycle, each reaction is marked with a number. The reactions where NAD+ is reduced to NADH.H+ are those marked with the numbers:

a) 1,3 and 4

b) 3,4 and 5

c) 3,4 and 6

d) 3,4 and 8

e) 5,6 and 7

f) 4,5 and 6

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I really like the questions that you have on the site, but could you please post answers to the ones that are missing them? thank you

option D is the answer.