A medical researcher is investigating the chemical and physical properties of substance that she isolated from the surface of charcoal-grilled meat. When the scientist mixes a small amount of the substance with living human cells, the chemical causes the rapid breakdown of the cells' plasma membranes. She is able to prevent this reaction by adding vitamin C to the mixture of the substance chemical and cells. Based on this information, the scientist has ________.
A. conducted an in vitro experiment under poorly controlled conditions
B. determined that the chemical isolated from charcoal-grilled meat is an oxidizing agent
C. discovered that vitamin C is has pro-oxidant activity during in vivo experiments
D. isolated a potential treatment for cancer in charcoal-grilled meat
Answer: B
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