Which of the following processes is the ...

Which of the following processes is the source of energy in chemoautotrophs for fixation of `CO_2` into carbohydrates ?

A

1.Oxidation of inorganic molecules

B

2.Oxidation of organic molecules

C

3.Reduction of organic molecules

D

4.Reduction/oxidation of any matter present in medium.

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The correct Answer is:

A

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