challenge: What were the approximate dates of the Frasnian stage in the Late Devonian Period?
  
  A. 402.7 - 392.2 million years ago
  B. 382.7 - 372.2 million years ago
  C. 372.2 - 362.7 million years ago
  D. 392.7 - 382.2 million years ago
  Answer: 