In a series of experiments, Avery treated heat-killed nonvirulent S bacteria with enzymes that degraded the proteins, DNA, and RNA of the S bacteria, then mixed this with nonvirulent R bacteria. S cells grew in all cases except the samples with degraded DNA. What did this demonstrate?
A. Protein from the S bacteria is necessary for bacterial transformation to occur. B. RNA from the S bacteria is necessary for bacterial transformation to occur. C. DNA from the S bacteria is necessary for bacterial transformation to occur. D. Protein, DNA, and RNA from the S bacteria are all necessary for bacterial transformation to occur.