If the $DNA$ codons are $ATG\ ATG\ ATG$ and a cytosine base is inserted at the beginning,which of the following will result?

  • A
    $A$ non-sense mutation
  • B
    $CA\ TGA\ TGA\ TG$
  • C
    $CAT\ GAT\ GAT\ G$
  • D
    $C\ ATG\ ATG\ ATG$

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