(i) A is the site of complete oxidation of a molecule of pyruvate by the stepwise removal of all the hydrogen atoms.
(ii) B ${CO}_{2}$ molecules are released in the above process for each molecule of pyruvate involved.
A B
1. Mitochondrial matrix 3
2. Perimitochondrial space 2
3. Mitochondrial matrix 6
4. Inner mitochondrial membrane 3

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answer is C.

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Detailed Solution

Complete oxidation of pyruvate occurs in mitochondrial matrix during link reaction and Krebs cycle.

3CO₂ are released for the oxidation of each pyruvic acid molecule (one in link reaction and two in Krebs' cycle).

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	A	B
1.	Mitochondrial matrix	3
2.	Perimitochondrial space	2
3.	Mitochondrial matrix	6
4.	Inner mitochondrial membrane	3