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Among the options provided, the correct answer to the question "Which of these is an example of an oxygen compound?" is C. water.
Here's an explanation:
1. Water, represented by the chemical formula H2O, is an oxygen compound. It consists of two hydrogen atoms bonded to one oxygen atom.
2. Glucose (option A) is a type of sugar and does not contain oxygen as the main component.
3. Amino acids (option B) are organic compounds composed of carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur. While they contain oxygen, they are not solely oxygen compounds.
4. Diamond (not listed as an option) is a form of carbon and does not contain oxygen.
Therefore, water is the example of an oxygen compound among the choices provided.
