Sandy had a cookie for a snack. Which of the following statements accurately describes the fate of the carbon atoms in the sugar molecules present in Sandy's cookie after she ingested it?
A. The carbon atoms were released as part of carbon dioxide, which later was excreted as part of exhaled air.
B. The carbon atoms combined with hydrogen ions to buffer the stomach acids.
C. The carbon atoms were stored in Sandy's bones until they were needed for some other cellular process.
D. The carbon atoms were released as part of carbon dioxide, which later was excreted as part of Sandy's urine.
Answer: B
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