The three boxes in this diagram represents the three major

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The three boxes in this diagram represents the three major biosynthetic pathways in aerobic respiration. Arrows represents net reactants or products.

Arrows numbered 4, 8 and 12 can all be :

1. ATP
2. H₂O
3. FAD⁺ or FADH₂
4. NADH

Correct Option: A

In the given diagram of aerobic respiration – pathway A is glycolysis, pathway B is Kreb’s cycle and pathway C is ETS, thus 4, 8 & 12 are ATP. ATP act as energy currency. The energy is trapped in form of ATP and it is broken down whenever and wherever it needs to be utilised.