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After oxidative decarboxylation of pyruvate into acetyl CoA, the Krebs cycle begins.
Early in glycolysis, one ATP is required for the conversion of glucose to glucose-6-phosphate by phosphohexokinase and one more ATP for the conversion of fructose-6-phosphate to fructose-1,6-biphopshate by phosphofructokinase.
However, fructose-1,6-biphopshate gives rise to two 3-carbon units, each of which generates 2 ATP in subsequent steps of ubstrate level phosphorylation giving a net yield of 2 ATP per glucose molecule.
Thus, 2 ATP molecules are formed from 1 glucose molecule.
So, the correct answer is option (1) Two.
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