How Could a Carbon Atom That Was Originally Present in a Glucose

How could a carbon atom that was originally present in a glucose molecule end up in a purine base that becomes incorporated in a molecule of DNA?

A) Glucose $\rightarrow$ acetyl CoA $\rightarrow$ amino acid $\rightarrow$ citric acid cycle $\rightarrow$ gluconeogenesis $\rightarrow$ purine base $\rightarrow$ DNA
B) Glucose $\rightarrow$ glycerol $\rightarrow$ triglyceride $\rightarrow$ acetyl CoA $\rightarrow$ pyrimidine base $\rightarrow$ purine base $\rightarrow$ DNA
C) Glucose $\rightarrow$ pyruvate $\rightarrow$ acetyl CoA $\rightarrow$ fatty acid $\rightarrow$ triglyceride $\rightarrow$ purine base $\rightarrow$ DNA
D) Glucose $\rightarrow$ acetyl CoA $\rightarrow$ citric acid cycle $\rightarrow$ amino acid $\rightarrow$ purine base $\rightarrow$ DNA
E) Glucose $\rightarrow$ pyruvate $\rightarrow$ lactic acid $\rightarrow$ pyrimidine base $\rightarrow$ amino acid $\rightarrow$ purine base $\rightarrow$ DNA