C it was now illegal for slaves to run away from their owner.
The answer too this question is B
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<span>The first workers' associations of the 19th century aimed to improve working conditions. Letter c)
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<span>States that "If an action or policy has a suspected risk of causing harm to the public or to the environment, in the absence of scientific consensus that the action or policy is harmful, the burden of proof that it is not harmful falls on those taking the action." </span>
