Question

how is nadh recycled (to nad+) in aerobic conditions?
by forming lactic acid
by donating electrons to the electron transport chain
by removing electrons from substrates in the citric acid cycle
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Explanation:

In aerobic conditions, NADH donates electrons to the electron - transport chain. As electrons move through the chain, protons are pumped across the inner mitochondrial membrane, and ATP is generated. This process also regenerates NAD⁺ from NADH. Forming lactic acid occurs in anaerobic conditions. Removing electrons from substrates in the citric acid cycle generates NADH, not recycle it to NAD⁺.

Answer:

By donating electrons to the electron transport chain