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(subst 'foo 'news '(no news is good news))

  • A: error
  • B: (no foo is good foo)
  • C: (no news is good foo)
  • D: (no foo is good news)
  • E: nil

    Answer: B

    (subst new old lst) will make a new copy of the given structure, substituting new for all instances of old.