Biotechnology companies say that voluntary guidelines for their industry are sufficient to ensure that no harm will result when a genetically altered organism is released into the environment. It is foolish, however, to rely on assurances from producers of genetically altered organisms that their products will not be harmful. Ttherefore, a biotechnology company should be required to apply to an independent regulatory board composed of scientists outside the biotechnology industry for the right to sell newly created organisms. Which one of the following principles, if accepted, most strongly justifies drawing the conclusion above? ['People who engage in an activity and have a financial stake in that activity should not be the sole regulators of that activity.', 'Voluntary guidelines are sufficient to regulate activities that pose little danger to the environment.', 'Issues of environmental protection are so important that they should not be left to scientific experts.', 'Methods that result in harm to the environment must sometimes be used in order to avoid even greater harm.']