4: A group of people were told that red M&M's caused cancer.  Later they
  were told that they had received incorrect information and that red
  M&M's were absolutely safe.  According to research on belief
  perseverance, the people

 B: continued to believe that red M&M's were harmful

    Correct.
Belief perseverance is where older beliefs remain intact, in spite of new information that presents convincing evidence the old belief is inaccurate or irrational.  In this situation, believing older incorrect information, that red M&M's causes cancer, is a good example of belief perseverance.
 

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