Experts please answer....

Dear student,
Please find below the answer:

The correct option is (3).
The TCA cycle or Krebs cycle is a set of biochemical reactions which are a part of aerobic respiration and utilize acetate generated from carbohydrates, fats, and proteins for the generation of energy. It also generates NADH in the process.

It starts with the condensation of the acetyl group with oxaloacetic acid (OAA) and water (H2O) to yield citric acid. 

Hope this clears your doubt.

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