A medical researcher has isolated a chemical from cigarette smoke. When the scientist mixes a small amount of the substance with living human cells, the chemical damages unsaturated fatty acids in the cells' plasma membranes. He is able to prevent this damage by adding vitamin E to the mixture of the chemical and cells. Based on this information, the scientist has ________.
A. discovered a vitamin-based cure for lung cancer
B. identified vitamin E as a prooxidant
C. determined that the chemical in cigarette smoke is an oxidizing agent
D. conducted an in vitro experiment under poorly controlled conditions
Answer: C
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